Low temperature, shape-selective formation of Sb<sub>2</sub>Te<sub>3</sub> nanomaterials and their thermoelectric applications

Nithiyanantham, U.; Ede, Sivasankara Rao; Ozaydin, M. Fevzi; Liang, Hong; Rathishkumar, Arumugam; Kundu, Subrata

doi:10.1039/c5ra17284e

Cited by 26 publications

(13 citation statements)

References 58 publications

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“…For bare CTAB(c), strong peaks between 1383 cm −1 and 1486 cm −1 are present due to symmetrical and asymmetrical C−H scissoring vibration of H 3 C−N moiety, at 1462 cm −1 and 960 cm −1 two strong peaks observed due to C−N stretching and a peak at 1141 cm −1 could be attributed to N−H bending. Peak at 1635 cm −1 of both mesoporous materials represented the bending vibration of hydroxyl groups [20–23] …”

Section: Resultsmentioning

confidence: 99%

“…Peak at 1635 cm À 1 of both mesoporous materials represented the bending vibration of hydroxyl groups. [20][21][22][23] After calcinations process (a), the all organic group related peaks have disappeared. There are only some characteristic peaks of silanes such as À OH stretching band of silanol group (SiÀ OH) condensation was observed around 3440 cm À 1 as a wide band.…”

Section: Chemical Characterizationmentioning

confidence: 99%

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Phosphorus Ester Containing Mesoporous Silica as Novel High‐Effective Flame Retardant in Polyurethane and Polyester Coatings

Aytan

Kahraman

2021

ChemistrySelect

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In this study mesoporous silica spheres (MPSs) and polyphosphoric acid based organophosphate ester flame retardant (FR material) material were synthesized and flame retardancy performance in acrylate-based polyurethanes (PUR) and polyester (PET) resins investigated. For this, both MPSs and FR material were synthesized according to literature and FR material was loaded into MPSs which takes the role of carrier. Loaded MPSs were put into UV curable PUR and PET resins and polymerized under UV radiation. Their characteristics were investigated by FT-IR, TGA, LOI, SEM and TEM. The results showed that FR material had excellent flame-retardant abilities for both PUR and PET series. The TGA curves suggested that synthesized FR material shows lower thermal stability at low temperatures than original materials however it showed good ability of char formation at higher temperatures, therefore improving the flame retardant property of samples. Moreover the LOI analysis showed that flame retardancy properties were improved significantly. The additive increased the LOI value from 20,5 and 21 to 26,5 and 27.

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Section: Resultsmentioning

confidence: 99%

Section: Chemical Characterizationmentioning

confidence: 99%

Phosphorus Ester Containing Mesoporous Silica as Novel High‐Effective Flame Retardant in Polyurethane and Polyester Coatings

Aytan

Kahraman

2021

ChemistrySelect

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“…The spectral patterns of the beach sand before and after the acid leach is not significantly different, so the possibility of the process did not affect the initial structure of the sand much. The CTAB showed to have CH3, methylene CH2, C-H in alkyl chain, and C-N group at 2923 cm -1 , 2850 cm -1 , 1477 cm -1 and 964 cm -1 [20,21], respectively. Those functional groups were matched with the CTAB structure in Figure 1.…”

Section: Functional Group Analysis Using Ftirmentioning

confidence: 97%

Synthesis of Mesoporous Silica From Beach Sand Using Variation of Cetyl Trimethyl Ammonium Bromide (CTAB)

Efiyanti¹,

Trisunaryanti²,

Bahri³

et al. 2021

Proceedings of the 3rd KOBI Congress, International and National Conferences (KOBICINC 2020)

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The potential for sand in Indonesia is very abundant because Indonesia has a long coastline than other countries. This research was conducted to explore the potential of beach sand as an alternative raw material to replace commercial silica. To obtain the natural silica, the beach sand was prepared and extracted into mesoporous silica. The reflux method was chosen to extract silica using NaOH solution, HCl solution, and CTAB surfactant. The mesoporous structure was potentially affected by CTAB and SiO2 ratio, and therefore, this research was focused more on the effect of CTAB weight variation (3; 4,5 and 6 g). Several instruments were used to analyze the characteristics of silica, such as Surface Area Analyzer (SAA), Scanning Electron Microscopy (SEM), and Fourier Transform Infrared Spectroscopy (FTIR). The mesoporous silica has siloxane (Si-O-Si) and silanol (Si-OH) functional group and showed a coral reef-like structure. The porosity properties of these materials ranging from 300-385 m2/g for the specific surface area, 5-8.8 nanometer for pore diameter, and 0.4-0.8 cm3/g for pore volume. Optimal CTAB weight found to be at 6 g, which produces the mesoporous silica with a surface area of 385.928 m2/g, an average pore diameter of 6.015 nanometers, and pore volume of 0.579 cm3/g.

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“…In earlier reports, the thermoelectric transport properties of the constituent phases, that is, Cu 2 Te and Sb 2 Te 3 , have been tuned by controlling the charge carrier concentration via doping/alloying − and by microstructural engineering. , Both chalcogenides crystallize with a trigonal crystal structure and are intrinsically p-type semiconductors that form a solid solution with each other over a wide range of compositions. Cu 2 Te has unique electronic properties and belongs to the phonon-liquid-electron-crystal (PLEC) system possessing low thermal conductivity. , Sb 2 Te 3 is a room-temperature thermoelectric material used mostly for refrigeration applications . A qualitative study of a set of Cu 2 Te–Sb 2 Te 3 pseudobinary alloys along with their microstructure and thermoelectric properties is available .…”

Section: Introductionmentioning

confidence: 99%

“…43,44 Sb 2 Te 3 is a roomtemperature thermoelectric material used mostly for refrigeration applications. 45 A qualitative study of a set of Cu 2 Te− Sb 2 Te 3 pseudobinary alloys along with their microstructure and thermoelectric properties is available. 40 However, very few studies in the literature aim to correlate the microstructural length scale and arrangements of multicomponent phases quantitatively with the thermoelectric power factor.…”

Section: Introductionmentioning

confidence: 99%

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic

Mukherjee

Aramanda

Legese,

et al. 2021

ACS Appl. Energy Mater.

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Using a set of controlled in situ grown lamellar composites of (Cu2Te)62.02–(Sb2Te3)37.98, we report a remarkable variation of transport properties of thermoelectricity not only as a function of microstructural length scale but also as a function of direction-dependent arrangement of the phases and hence their interfaces. A quantitative evaluation of the microstructure along the transverse and the longitudinal directions of growth, imposed by the temperature gradient and growth rate in a unidirectional solidification setup, has been carried out. The microstructure is quantified through image analysis using fast Fourier transforms as well as a cluster base connectivity model and is further correlated with the thermoelectric transport properties. A marked anisotropy of properties as a function of measurement direction in the microstructural landscape could be observed. A maximum power factor of ∼1.4 mW m–1 K–2 and a figure of merit of 0.29 could be obtained at 580 K along the transverse direction for the sample with the characteristic microstructural length scale of 2.41 μm. This has an implication in engineering a thermoelectric device in terms of engineering power factor and output power density. For a ΔT of 250 K, we report a difference of 0.4 W cm–2 in output power density between the transverse and the longitudinal directions that have an identical microstructural length scale of 2.41 μm.

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Low temperature, shape-selective formation of Sb₂Te₃ nanomaterials and their thermoelectric applications

Abstract: Thermoelectric properties of shape-selective Sb2Te3 nanomaterials which synthesized at a low temperature within a short reaction time have been reported.

Cited by 26 publications

References 58 publications

Phosphorus Ester Containing Mesoporous Silica as Novel High‐Effective Flame Retardant in Polyurethane and Polyester Coatings

Phosphorus Ester Containing Mesoporous Silica as Novel High‐Effective Flame Retardant in Polyurethane and Polyester Coatings

Synthesis of Mesoporous Silica From Beach Sand Using Variation of Cetyl Trimethyl Ammonium Bromide (CTAB)

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic

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Low temperature, shape-selective formation of Sb2Te3 nanomaterials and their thermoelectric applications

Abstract: Thermoelectric properties of shape-selective Sb2Te3 nanomaterials which synthesized at a low temperature within a short reaction time have been reported.

Cited by 26 publications

References 58 publications

Phosphorus Ester Containing Mesoporous Silica as Novel High‐Effective Flame Retardant in Polyurethane and Polyester Coatings

Phosphorus Ester Containing Mesoporous Silica as Novel High‐Effective Flame Retardant in Polyurethane and Polyester Coatings

Synthesis of Mesoporous Silica From Beach Sand Using Variation of Cetyl Trimethyl Ammonium Bromide (CTAB)

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu2Te–Sb2Te3 Eutectic

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Product

Resources

About

Low temperature, shape-selective formation of Sb₂Te₃ nanomaterials and their thermoelectric applications

Anisotropy of Microstructure and Its Influence on Thermoelectricity: The Case of Cu₂Te–Sb₂Te₃ Eutectic