Temperature dependent structural and optical properties of tin oxide nanoparticles

Ahmed, Arham S.; Azam, Ameer; Shafeeq, M. Muhamed; Chaman, M.; Tabassum, Sartaj

doi:10.1016/j.jpcs.2012.02.030

Cited by 49 publications

(19 citation statements)

References 18 publications

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“…Similarly, SnO 2 NPs with diameters between 5 and 20 nm obtained by annealing bulk SnO 2 have energy band gaps between 4.1 and 3.8 eV due to quantum confinement. 47 Interestingly, we observe a systematic change in the PL of the Cu 2 SnS 3 /SnO 2 core-shell NWs with increasing temperature as shown in Fig. 3.…”

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confidence: 60%

Ultraviolet emission from low resistance Cu2SnS3/SnO2 and CuInS2/Sn:In2O3 nanowires

2014

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SnO2 and Sn:In2O3 nanowires were grown on Si(001), and p-n junctions were fabricated in contact with p-type Cu2S which exhibited rectifying current–voltage characteristics. Core-shell Cu2SnS3/SnO2 and CuInS2/Sn:In2O3 nanowires were obtained by depositing copper and post-growth processing under H2S between 100 and 500 °C. These consist mainly of tetragonal rutile SnO2 and cubic bixbyite In2O3. We observe photoluminescence at 3.65 eV corresponding to band edge emission from SnO2 quantum dots in the Cu2SnS3/SnO2 nanowires due to electrostatic confinement. The Cu2SnS3/SnO2 nanowires assemblies had resistances of 100 Ω similar to CuInS2/In2O3 nanowires which exhibited photoluminescence at 3.0 eV.

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confidence: 60%

Ultraviolet emission from low resistance Cu2SnS3/SnO2 and CuInS2/Sn:In2O3 nanowires

2014

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“…This introduces the mechanochemical synthesis method as a proper band gap tuning technique. It is reported that [55][56][57][58] the shape and size (even the lattice strain and the preparation duration) of nanostructures could highly influence the band gap values even if there are no phase changes. Consequently, it seems that different band gap values for the prepared BiOBr nanostructures is attributed to their different shape and sizes.…”

Section: Resultsmentioning

confidence: 99%

Solid state preparation and photocatalytic activity of bismuth oxybromide nanoplates

et al. 2015

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A mechanochemical method was applied to prepare bismuth oxybromide (BiOBr) nanoplates using bismuth nitrate pentahydrate and potassium bromide for 15 (A15), 30 (A30) and 60 (A60) minutes. Scanning electron microscopy studies showed that all the products were comprised of nanoplates. Aggregated nanoplates along with microblocks were observed for A15 and A30 and the entire morphology was not homogenous. The morphology of A60 was uniform and consisted of thin and isolated nanoplates. Evaluation of the X-ray diffraction patterns showed that the purity and crystallinity of the products improved by increasing the milling time. The energy dispersive X-ray analysis confirmed the high purity of the products. Fourier transform infrared spectroscopy, photoluminescence spectroscopy and nitrogen adsorption-desorption analysis using the Brunauer-Emmett-Teller technique were also used to study the products. Diffuse reflectance spectroscopy studies clarified that all the samples were indirect band gap semiconductors with the band gap of 3.25 eV for A15 and the narrow band gap of 2.74 eV for A30 and A60. Photocatalytic studies revealed that A30 has the highest photocatalytic activity among the products. The effect of oxygen vacancies, surface defects, morphology and band gap of products on the photocatalytic or photosensitized degradation of rhodamine B (RhB) and pentachlorophenol (PCP) aqueous solutions were studied.

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“…Various synthesis methods such as sol-gel [14][15][16][17][18], RF sputtering [19], electrospinning [20][21][22][23], spray pyrolysis [24,25], vacuum evaporation [26], and hydrothermal method have been employed [27]. Among them, hydrothermal technique has been extensively used for the synthesis of SnO 2 .…”

Section: Introductionmentioning

confidence: 99%

Temperature Optimized Ammonia and Ethanol Sensing Using Ce Doped Tin Oxide Thin Films in a Novel Flow Metric Gas Sensing Chamber

Govardhan

Grace

2016

Journal of Sensors

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A simple process of gas sensing is represented here using Ce doped tin oxide nanomaterial based thin film sensor. A novel flow metric gas chamber has been designed and utilized for gas sensing. Doping plays a vital role in enhancing the sensing properties of nanomaterials. Ce doped tin oxide was prepared by hydrothermal method and the same has been used to fabricate a thin film for sensing. The microstructure and morphology of the prepared materials were analysed by SEM, XRD, and FTIR analysis. The SEM images clearly show that doping can clamp down the growth of the large crystallites and can lead to large agglomeration spheres. Thin film gas sensors were formed from undoped pure SnO2and Ce doped SnO2. The sensors were exposed to ammonia and ethanol gases. The responses of the sensors to different concentrations (50–500 ppm) of ammonia and ethanol at different operating temperatures (225°C–500°C) were studied. Results show that a good sensitivity towards ammonia was obtained with Ce doped SnO2thin film sensor at an optimal operating temperature of 325°C. The Ce doped sensor also showed good selectivity towards ammonia when compared with ethanol. Pure SnO2showed good sensitivity with ethanol when compared with Ce doped SnO2thin film sensor. Response time of the sensor and its stability were also studied.

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Temperature dependent structural and optical properties of tin oxide nanoparticles

Cited by 49 publications

References 18 publications

Ultraviolet emission from low resistance Cu2SnS3/SnO2 and CuInS2/Sn:In2O3 nanowires

Ultraviolet emission from low resistance Cu2SnS3/SnO2 and CuInS2/Sn:In2O3 nanowires

Solid state preparation and photocatalytic activity of bismuth oxybromide nanoplates

Temperature Optimized Ammonia and Ethanol Sensing Using Ce Doped Tin Oxide Thin Films in a Novel Flow Metric Gas Sensing Chamber

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