Activated Carbon and Metal Chalcogenide in Applied Materials Research
Nano material is an important field in world of science and technology. In this work, activated carbon and metal chalcogenide thin films were discussed. Activated carbon has high surface area and porosity structure. Basically, it could be synthesized by using various raw materials under carbonization and chemical activation process. Utilization of activator such as KOH, NaOH, zinc chloride, phosphoric acid, sulphuric acid could improve texture properties and adsorption capacity. On the other hand, metal chalcogenide thin films have been prepared by using various deposition techniques including physical and chemical method. These materials have great potential in solar cell, sensor device, laser device and optoelectronic applications. Characterization of metal sulfide, metal selenide and metal telluride thin films was studied by using different tools
Introduction
Currently, there are several types of nano materials have been investigated. These materials are produced at very small scale, in the range from 1-100 nm. They show unique properties including electronic, optical and mechanical behaviors based on the results obtained from various characterization tools. Therefore, these materials could be used in various applications such as medical, environmental, solar cell, optoelectronic, sensor and laser devices. Activated carbon could be used as cheap adsorbent to remove heavy metal, dye, pollutants from wastewater [1]. There are many researchers investigate texture characteristics of activated carbon including surface area, microspore diameter distribution and total pore volume [2]. Preparation of activated carbon from different raw materials including agricultural wastes, waste materials [3], food wastes and agricultural by-products because of affordability, local availability [4] and efficiency in removing many pollutants [5]. Chalcogenide metal thin films received great attention due to several unique properties [6, 7]. Chemical bath deposition, spray pyrolysis, electro deposition, pulsed laser deposition, thermal evaporation, vacuum evaporation, magnetron sputtering, molecular beam epitaxy, metal organic chemical vapour deposition, plasma enhanced chemical vapour deposition, sol gel, spin coating, successive ion layer adsorption and reaction method have been reported by many scientists in order to produce different nanostructured thin films [8, 9, 10]. In this work, activated carbon and metal chalcogenide thin films have been discussed. Properties and applications of these nanostructured materials have been reported.
Literature Review
Activated Carbon
Surface area and pore characteristics of activated carbon prepared by using various raw materials as indicated in Table 1. Activated carbon has high surface area and high micro porosity structure. It could be produced from various precursors such as agricultural wastes. Activated carbon was synthesized under carbonization and activation process. The activation process could be grouped into physical and chemical activation. Carbon dioxide or water stream was used in physical activation. Meanwhile, several types of activator such as zinc chloride, phosphoric acid, sodium hydroxide and potassium hydroxide were employed during chemical activation (Table 2). These activators are considered as cheaper and less corrosion. The obtained carbons could be employed for wastewater treatment since few decades ago. Typically, it could be utilized in different forms such as power, granular and impregnated type. Nowadays, “dye wastewater” produced through human activities and various industries. It must be treated with activated carbon to avoid allergic dermatitis and inhibit sun light penetration in the water. Up-to-date, wastewater treatment in the dye industry could be carried out by using various methods. Generally, food industry, textile industry, paper industry and leather industry contributed to the dye production. Adsorption, solvent extraction, and ion exchange technique were used to remove dye from wastewater. The advantage of each technique was highlighted in Table 2.
| Raw Material | Surface Area (m2/g) | Porosity Structure |
|---|---|---|
| Wheat bran | Surface area was 2543 m2/g | • Activated carbon prepared at 700°C showed more micropores. • Activated carbon prepared at 900°C more mesoporous [11]. |
| Kanlow Switchgrass, Public Miscanthus biomass | Surface area values are 783 (Public Miscanthus biomass) and 519 (Kanlow Switchgrass) m2/g. | • Public Miscanthus biomass: Micropore volume=0.24 cm3/g, mesopore volume =0.17 cm3/g [12]. • Kanlow Switchgrass: Micropore volume=0.18 cm3/g, mesopore volume =0.07 cm3/g. |
| Popcorn | Surface area: 2997 to 3074 m2/g | • Micropore and mesopore were produced in chemical activation in the presence of sodium hydroxide [13]. • Total pore volume: 1.54 to 2.42 cm3.g-1 |
| Corn cob | Surface area was found in the range of 553 to 1270 for the sample prepared under zinc chloride as activator. | • Total pore volume: 0.29 to 0.67 [14]. • Micropore volume: 0.045 to 0.28. |
| Mangosteen peel | Surface area is 1621 for the sample prepared 600 °C, 30 minutes, 1:4 impregnation ratio (ZnCl solution). 2 | • Total pore volume was 1.8 cm3/g for the sample prepared at optimized conditions [15]. |
| Peach, coconut, apricot | Coconut: 1101 Apricot: 819 Peach: 793 | • Coconut: micropore volume is 0.24 [16]. • Apricot: micropore volume is 0.184. • Peach: micropore volume is 0.206. |
| Tabah bamboo | Surface area was increased from 50.45, 108.5 to 210 m2/g with increasing the activation time (50, 100 and 150 minutes) | • Total pore volume increases (0.059, 0.089 and 0.09) as the activation time was increased [17]. |
| Palimera sprout | Surface area was 2090 m2/g in the presence of KOH | • Total pore volume is 1.44 cm3/g [18]. |
| Slash pine wood | 979 – 1185 m2/g under various conditions. | • 0.32 to 0.37 at different experimental conditions [19]. |
| Jute fiber | 2682, 1909 and 2494 m2/g for the samples produced from bottom, middle and top part. | • The activated carbon produced using bottom part indicated the highest portion of micropores if compared to other parts [20]. |
| Petroleum coke | Surface area increased from 2209 to 2799 m2/g at lower temperature (100-250°C), then reduced to 2205 m2/g at 300°C. | • Micropore volume increased (0.96 to 1.21 cm3/g) with the increase of temperature up to 250°C [21]. |
| Soft-drink, Coca- Cola | There are different surface areas when the amount of Coca-Cola added as 3 (1140 m2/g), 3.5 (1400 m2/g) and 4 g (1250 m2/g). | • Total pore volume of activated carbon prepared at 150°C is much higher (2.8 cm3/g) if compared to 100°C (1.55 cm3/g) and 130°C (1.75 cm3/g) [22]. |
| Cactus, pear seed | Surface area of activated carbon prepared using cactus increased with the impregnation rate from 0.5 (171 m2/g), 1 (377 m2/g) and 2 (471 m2/g). | • Surface area was 590, 815 and 867 m2/g with the degree of impregnation rate (0.5, 1 and 2) [23]. |
| wood | Higher surface area (779-858 m2/g) was observed in the presence of nitric acid during the oxidation process if compared to raw activated carbon (735 m2/g). | • The samples treated with nitric acid solution indicated higher percentage of mesoporous (48.9-54.7 %) [24]. |
| Coconut shell | Surface area was 1916 m2/g | • Microporous volume was 0.25 cm3/g [25]. |
| Olive tree pruning | Surface area (800-3490 m2/g) strongly depended on activation conditions. | • Total pore volume is in the range of 0.33 – 1.66 cm3/g for all the samples [26]. |
Table 1: Surface area and pore characteristics of activated carbon prepared by using various raw materials.
| Solvent extraction | Ion exchange | |
|---|---|---|
| Low energy is required | Inexpensive technique | Environmental friendly technique |
| Low maintenance cots is needed | Repeatable and reproducible process [27]. | Cheap maintenance |
| Simplicity set up, easy operation | Simple operation [28]. | Efficient method |
| Simple design | Simple apparatus | Re-usable |
| Local availability | Sensitive | Cost effective |
| Wide pH range | High concentration of active sites [29]. | |
| High performance [30]. | High trans-formation of components. | |
| Excellent removal of a wide variety of dyes in wastewater [31]. |
Table 2: Several techniques of removing dye, heavy metal and pollutants from wastewater.
Chemical activator could be used during the synthesis of activated carbon (Table 3). For example, sulphuric acid, sodium hydroxide, potassium hydroxide, phosphoric acid, zinc chloride, potassium carbonate (K2CO3), potassium dihydrogen phosphate (KH2PO4), sodium hydroxide and potassium hydroxide play an important role during the chemical activation process. Generally, carbonization process was carried out, then single step chemical activation was done further. There are some advantages of chemical activation including reduce operation time, operational cost, energy consumption, and production with higher efficiency could be seen. Researcher reported that great improvement could be observed such as encourage production of crosslink, limit the production of volatile compounds, and dissolve the cellulosic component during the chemical activation and dehydrogenation capability of material. Up-to-date, the influence of impregnation ratio has been reported by many researchers. It is described as the weight of chemical activator (in grams) to the weight of dried carbon used.
| Activator | Highlighted Results |
|---|---|
| ZnCl 2 | • Activated carbon was produced using pine cone [32]. • Activated carbon with 1 impregnation ratio exhibited main microporous structure and lower surface area (1666 m2/g). • Sample with 4 impregnation ratio indicated higher surface area (2771 m2/g), large amount of mesoporous (1.22 cm3/g), less microporous (0.9 cm3/g). • The obtained activated carbon indicated 87 F/g specific capacitance. |
| ZnCl 2 | • Activated carbon prepared using Arundo donax in the presence of activator [33]. • Sample yields reduced with an increase in impregnation ratios from 0.5 to 3 at carbonization temperature of 300°C. • The best impregnation ratio was 1.5, and produced the highest surface area (1874 m2/g). |
| ZnCl , K CO , 2 2 3 KH PO 2 4 | • There are several chemical activators were used to produce activated carbon from tamarind seed [34]. • Activated carbon prepared using zinc chloride has the highest percentage (39.18 %) of yield if compared to KH PO (26.8 %) and K CO (18 %). 2 4 2 3 • Zinc chloride is the best activator, and often used as activating agent for green precursor. • The carbon prepared using zinc chloride showed the highest iodine number and porosity as well. |
| Zinc chloride | • Sunflower seed husk was used as raw material to produce activated carbon [35]. • Iodine number increased (1221 -1545 mg/g) with increasing of impregnation ratio from 0.5:1, 1:1 and 1.5:1. • The best impregnation ratio was 1:1, which produced the highest surface area (1511 m2/g) and total pore volume (0.35 cm3/g). |
| Phosphoric acid | • The influence of phosphoric acid concentration was studied from 36 to 85 wt %. • The obtained results show the best concentration was 36 % for the activated. carbon prepared using chestnut, cedar and walnut wood [36]. |
| KOH | • Fir wood was used to synthesize activated carbon [37]. • Surface area (891-2794 m2/g) and fraction of micropore volume (0.76-0.82) are strongly depended on KOH/sample ratio from 0.5 to 6. |
| KOH, H PO 3 4 | • Wood was employed as raw material • The adsorption of chromium (VI) ions was higher in KOH-activated carbon if compared to H PO 3 4 activated carbon [38]. |
| H PO 3 4 | • C. schweinfurthii nutshell was utilized to prepare activated carbon [39]. • Large amount of carbon (88.6 %) could be observed indicating phosphoric acid retain carbon and to prevent loss of other volatile material. • Results reflected that yield increases with impregnation ratio (40-60 %), temperature (200- 400 °C) and time (20 to 60 minutes). • Increased in concentration of activator, leads to enlarge the pores, and improve the adsorption capacity. |
| Sulfuric acid | • Activated carbon was produced using sal wood [40]. • The highest decolorizing power (27 mg/g) could be observed as the impregnation ratio was 0.75. • Surface area increased (1012-2279 m2/g) as the impregnation ratio was increased from 0.25 to 0.75. |
| Sulfuric acid | • Orange peel was used to produce activated carbon. • Carbon prepared using activator showed higher surface area (1934 m2/g) and well-developed pore. • Total pore volume and surface area were strongly depended on impregnation time. |
| Sulfuric acid | • Sunflower oil cake was employed to prepare activated carbon [41]. • AC1, AC 2 and AC 3 represented impregnation ratio of 0, 0.85 ad 1.9, respectively. • Specific surface area, total pore volume and micropore area are found to be 8.8 m2/g, 0.0063 cm3/g and 8.26 m2/g in AC 1. |
| KOH, K CO 2 3 | • Soy bean oil cake was used to synthesis activated carbon at 800 °C using KOH (impregnation ratio of 1) • This raw material is considered as cheap lignocellulosic materials • Higher surface area could be produced by using K CO (1352.9 m2/g)if compared to KOH at 800°C. 2 3 • Higher ash and Sulphur content could be observed for the sample impregnated with KOH [43]. |
| KOH, K CO 2 3 | • Grape seed was used to synthesis activated carbon by using different activators [44]. • The results are mainly microporous, but various surface area if using 25% KOH (1222 m2/g) and 50% K CO (1238 m2/g). 2 3 • Higher yield could be observed at 600 °C if compared to 800 °C for both activators. |
| KOH | • Rice straw was used to produce activate carbon via carbonization and activation method [45]. • High methylene blue adsorption, high yield, and high surface area (1917 m2/g) could be obtained after these two steps. |
| Phosphoric acid | • Coconut shell was used to prepared activated carbon [46]. • Sample impregnated with 0.25 M of phosphoric acid can improve toluene (95.8 to 98.1 %) and isopropanol (95.2 to 97.2 %) removal efficiency. • Surface area reduced from 724.9 to 240.5 m2/g as the concentration of phosphoric was increased (0.25 to 3M) indicating activator occupied the pores. |
| NaOH | • Activated carbon produced using rice husk under various activation temperatures [47]. • FTIR spectra revealed that formed basic group such as carbonyl and quinone at higher activation temperature. • The films prepared at 800 °C showed the highest amount of basic group, could be used in supercapacitor applications. • Surface area and total pore volume varies 2482-2681 m2/g and 1.2929-1.4016 cm3/g. |
| NaOH | • Coconut shell was used to produce activated carbon under various impregnation ratios such as 1:1, 2:1 and 3:1. • Surface area (783 to 2825 m2/g) increased with increasing impregnation ratio [48]. |
Table 3: Several chemical activators have been used to prepare activated carbon.
Metal Chalcogenide Thin Films
Thin films have received great attention due to good chemical, physical [49], optical and electrical properties. The obtained films have been used in many applications such as gas sensing, solar cell [50], sensor device, laser device, energy conversion, energy storage and field-effect transistors. There are many deposition techniques have been used to prepare thin films. Basically, these deposition techniques could be divided into physical or chemical method. Research findings supported that each of these techniques has benefit and limitation as well. Quality and properties of films strongly depended onto deposition method as well [51].
Atomic layer deposition could be used to synthesis thin films. This deposition technique has many advantages including produce pin hole free morphology, synthesis films at low temperature, control film thickness easily and high aspect ratio coating. Basically, thin films are slowly formed from different precursors on substrate. For example, “first raw material” is adsorbed on the surface of substrate in order to form monolayer as shown in Figure 1. Then, any excess (first raw material) is removed. “Second raw material” is added and reacted with “first raw material” to form layer on the surface of substrate. Following that, “second raw material” is cleared from the reaction chamber. This process is repeated until reach desired thickness.
Single phase copper sulphide films have been prepared at 140-160 °C in the presence of solid sulphur and copper acetylacetonate. These sample are p-type films, band gap values in the ranges of 2.4 to 2.54 eV. Higher growth arte and flake like morphology could be observed when the temperature was increased above 160°C [52]. H2S was used to provide sulphur ion [53] during the deposition process at 130 to 200°C. Optical properties show that direct (2.2 to 2.5 eV) and indirect band gap (1.6 to 1.8 eV) could be found. Growth of Bi2Se3 films have been prepared in the presence of Na2SeO3 and Bi(NO3)3 solution. The sphalerite ZnSe films have been prepared on different substrates [54]. ZnSe thin films could be used in white light emitting electroluminescence displays. ZnS films are prepared using hydrogen sulphide and diethyl zinc in 200-350°C [55]. The film growth is depended on various conditions such as temperature and purge times. Tin selenide thin films are p-type conductance, have hole mobility of 10 cm2/V.s and Ion/Ioff ratio of 105. Orthorhombic
structure and smooth morphology are observed [42]. Copper indium sulphide films have been grown onto substrate in the presence of CuCl, InCl3 and H2S [56] at 380°C. The materials were used to absorber in solar cell device with conversion efficiencies up to 2.8 %.
Chemical bath deposition method is considered as cost- effective method to produce polycrystalline films under larger scale deposition. The obtained films are quite stable, however, strongly depended on experimental conditions such as pH, concentration of solution, deposition time, complexing agent. The presence of complexing agent improves the quality of thin films. This technique has simple experimental setup. Chemical bath contains metal ion and chalcogen ion solution, pH meter and substrate. During the deposition process, substrate will be immersed into chemical bath. There are two processes could be observed in this method. Formation of films occurred by sequential ionic reactions under ion-by-ion process. Another process called cluster process, where colloidal particles are absorbed at the substrate surface to produce layer. Copper sulphide thin films were prepared in the presence of amino acid [57]. Morphology and structure studies showed the nanoflake particle with hexagonal structure of complexing agent (amino acid). Thin films produced by using alanine, glycine and serine, showed thickness of 42, 55.4 and 70 nm respectively. Chemical bath deposition of lead selenide in the presence of tri-sodium citrate as described [58]. Researchers explain that thickness increased in longer deposition time (5 hours), indicating complexing agent can control Pb2+ ions during the experiment. XRD data showed that the films synthesized for 4 and 5 hours have more diffraction peaks and higher intensities. AgAlS2 films have been produced using silver nitrate, aluminium sulphate, thiourea and EDTA (complexing agent). Film thickness increased from 0.03 µm to 0.52 µm in longer deposition time [59]. The obtained band gap values are in the range of 2.15 to 2.4 eV. Preparation of tin sulphide thin films by using stannous chloride, thioacetimide and tartaric acid. Formation of complex ion was observed, Sn2+ ions combined with S2- ions to form SnS films. The films prepared at 70°C show high optical conductivity, low loss of power, absorption edge was shifted to longer wavelength [60]. The quartz was used as substrate in order to prepare ZnS films by using NH4OH. Thickness of 200 nm have been produced, and could be used in optoelectronic applications. Energy dispersive X-ray analysis results supported that ratio 1:1.1 (Zn:S) for all samples [61]. Chemical bath deposited CdS0.5Se0.5 films were used in temperature sensor, holography, and optical waveguide. Visual observation indicated the yellowish orange films were synthesized onto non-conducting glass substrate. Complexing agent such as 8hydroxyquinoline was used to control release Cd2+ ions slowly. An increase of the crystalline size leads to decrease in the electrical resistivity [62].
Cadmium selenide thin films could be used in electronic, optoelectronic and photovoltaic. Deposition was carried out onto soda lime glass in the presence of ammonia. The zinc blende structure and band gap (1.8 to 1.9 eV) were observed for all the samples prepared using cadmium chloride and sodium selenosulphate. Morphology studies indicated bigger grain could be seen when the concentration of ammonia (0.4 to 0.8 M) was increased [63].
Electrodeposition is an example of chemical deposition technique. Thin films could be synthesized by using electro deposition method at room temperature. This technique is considered as low cost and large scale deposition could be carried out. Commonly, it involves the reduction of metallic ions that are produced from the electrolyte. Complexing agent plays an important role in order to bring the reduction potentials of the individual elements closer.
Stainless steel was used as substrate to prepare cadmium selenide films by using ethylenediaminetetraacetic acid (EDTA). The obtained CdSe films show n-type conductivity [64]. CdSe could be used in solar cell application. The obtained fill factor and power conversion efficiency were 0.31 and 0.34 %, respectively. Cadmium sulphide films were deposited onto Au (111) substrate [65] under various pH values in the presence of EDTA. Structure studies show the formation of the cubic (pH 5) and hexagonal structure (pH 4). The growth of Sb2Se3 films at different deposition potentials by using citric acid [66]. Energy dispersive X-ray analysis data supported that the films prepared at -0.8 and -1 V (versus Saturated Calomel Electrode), displayed atomic composition close to 40:60.
The CuInSe2 thin films were prepared by using sodium citrate [67]. When the concentration of complexing agent was increased, cathodic shifts of the selenium and copper were observed. Further, researchers explain that citrate ions do not change the indium potential but improves its crystallinity. Nanostructured AgInSe2 thin films were deposited onto different substrates such as molybdenum/ glass and ITO glass [68] by using potassium thiocyanate (KSCN). XRD data showed the strongest peak corresponded to (112) plane of tetragonal chalcopyrite structure. Optical properties revealed that the obtained films covered the whole visible range, and transparent in the near infrared region. The KSCN was used as complexing agent during the deposition process in order to produce CuInSe2 thin films [69]. The electrolytic bath contains Cu+, In3+, Se4+ ions and thiocyanate ions. Ternary compound such as Cd-Fe-S films were synthesized by using Na2EDTA (ethylenediamine tetra acetic acid disodium) [70]. Band gap value strongly depended (from 2.43 to 0.81 eV) on the content of iron from 0 to 1. Based on the experimental results, the best content was when x=0.2. Because of these films are more photosensitive than other compositions. HgCdTe thin films were deposited onto SnO2 coated glass substrate by using acetonitrile [71], CdCl2, HgCl2 and Te reacted with nitric acid. No deposition could be observed without complexing agent. The films prepared under complexing agent indicated the sharp peak corresponded to (111) plane. These films are polycrystalline with cubic structure. According to experimental findings, the best stoichiometry was observed when the composition, x=0.15, 0.3 and 0.6 at deposition potential of 0.65, 0.7 and 0.75 V (versus saturated calomel electrode). Nanostructured CdZnTe films were prepared using acetonitrile under different deposition potentials [72]. Uniform morphology with grain size of 1 µm could be seen for the films prepared at deposition potential of -0.5 V. Scanning electron microscopy studies revealed that grain size reduces with increasing in deposition potential. Electrical studies indicated n-type and p-type could be observed in as-deposited film and annealed films, respectively.
Quaternary Cu2ZnSnS4 films were deposited onto Mo- coated soda lime glass substrates at room temperature [73]. The films are nearly stoichiometric when 25 mL of complexing agent were used. Field emission scanning electron microscopy [FESEM] revealed that grain size reduces when the volume of tri-sodium citrate was increased.
Conclusion
Experimental results showed there are several raw materials could be used to produce activated carbon under carbonization and activation process. The obtained activated carbon showed higher surface area and porosity structure in the presence of chemical activator. Metal chalcogenide thin films have been synthesized by using various techniques. Research findings indicated these material could be employed in solar cell, sensor, laser and optoelectronic applications.
Acknowledgment
The author would like to thank INTI INTERNATIONAL UNIVERSITY for financial support.
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