Preparation of porous SnO2 microcubes and their enhanced gas-sensing property

In this work, well-defined three-dimensional aurelia-like SnO 2 micro-nanostructures have been successfully obtained through a simple and facile one-step low-temperature hydrothermal strategy in the presence of CTAB (cetyltrimethylammonium bromide) and PVP (polyvinylpyrrolidone), and developed for acetone gas detection. Such a unique structure and morphology of the as-obtained product is used to comprehensively characterize via techniques of XRD, SEM, TEM and HRTEM. The results reveal that 10 the aurelia-like SnO 2 micro-nanostructures are composed of two parts by the crown and tentacles. The crown and tentacles are assembled from a chassis of mass stunted, disorderly, cumulate nanosheets and a large number of curvy, uneven nanobelts, respectively. The special aurelia-like structure of the SnO 2 micro-nanostructures endow nanostructures-based sensors with enhanced acetone gas sensing performances in terms of a fast response time(2 s)/recovery time(23 s), high sensitivity, good repeatability 15 and well sensing selectivity at lower working temperature. The possible formation growth mechanism of the aurelia-like micro-nanostructures and a morphology-dependent sensing mechanism are proposed.

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“…we have added the gas sensing performance of 15 commercial SnO 2 nanoparticles from Ref. 9 and Ref. 54.…”

Section: Gas Sensing Propertiesmentioning

confidence: 99%

Enhanced acetone gas sensing properties by aurelia-like SnO₂micro-nanostructures

Wang

Chi

et al. 2015

CrystEngComm

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“…This property, together with the wide availability of highly sensitive conductivity measurement devices, makes MOS nanostructures very attractive for high sensitivity gas sensors 7 . Formaldehyde detectors using SnO 2 nanostructures have been extensively reported [8][9][10] . One drawback of the SnO 2 based detector is the high working temperature (typically above 200°C) [11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO₄ modified ZnO nanoparticles

et al. 2015

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A light activated miniature formaldehyde sensor working at room temperature is fabricated by CdSO4 modified ZnO nanoparticles. The CdSO4 is deposited on the surface of the ZnO nanoparticles as a separated phase rather than doping into the lattice of ZnO. The Cd 2+ and SO4 2on the surface play a synergic effect for the high sensitivity to formaldehyde. The sensor shows high sensitivity to formaldehyde, with detection limit lower than 1 ppm while shows no response to ethanol and very weak response to acetone. With engineering efforts, a highly compact prototype formaldehyde sensor is obtained, which is very convenient for portable formaldehyde specific detection.

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“…In the absence of SHA, the centres of Sn 3d 3/2 and Sn 3d 5/2 were at 495.06 and 486.64 eV. The binding energy difference between the two peaks was 8.4 eV, which indicates a normal oxidation valence state of Sn 4+ in the SnO 2 crystals [38]. After SHA treatment, the shifts in the binding energy of the Sn 3d spectra were negligible.…”

Section: X-ray Photoelectron Spectroscopy (Xps) Analysismentioning

confidence: 91%

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Tian

Gao

et al. 2018

Minerals

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Abstract:Cassiterite is the most common and important tin-bearing mineral, and calcite, a primary gangue mineral is generally found in tin deposit. The flotation separation of cassiterite from calcite remains a challenge due to their similar response to traditional reagents. In cassiterite flotation, sodium oleate (NaOL) and sodium silicate (SS) have been widely used as a collector and a depressant, respectively. However, the low selectivity of NaOL and the large amount of SS required (which leads to serious problems in wastewater treatment) remain a difficult issue. In this study, a novel reagent scheme using lead nitrate as the activator, salicylhydroxamic acid (SHA) as the collector and carboxymethyl cellulose as the depressant was employed to improve the separation selectivity of cassiterite from calcite. Results of the flotation experiment using this new reagent scheme showed that compared with the previously reported scheme using benzohydroxamic acid (BHA) as the collector, the separation of cassiterite from calcite exhibited a higher selectivity and selectivity index (SI). The mechanism of the selective separation was investigated by zeta potential measurements, Fourier transform infrared and X-ray photoelectron spectroscopy analysis.

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Preparation of porous SnO2 microcubes and their enhanced gas-sensing property

Cited by 91 publications

References 40 publications

Enhanced acetone gas sensing properties by aurelia-like SnO₂micro-nanostructures

Enhanced acetone gas sensing properties by aurelia-like SnO₂micro-nanostructures

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO₄ modified ZnO nanoparticles

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

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Preparation of porous SnO2 microcubes and their enhanced gas-sensing property

Cited by 91 publications

References 40 publications

Enhanced acetone gas sensing properties by aurelia-like SnO2micro-nanostructures

Enhanced acetone gas sensing properties by aurelia-like SnO2micro-nanostructures

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO4 modified ZnO nanoparticles

Selective Flotation of Cassiterite from Calcite with Salicylhydroxamic Acid Collector and Carboxymethyl Cellulose Depressant

Contact Info

Product

Resources

About

Enhanced acetone gas sensing properties by aurelia-like SnO₂micro-nanostructures

Enhanced acetone gas sensing properties by aurelia-like SnO₂micro-nanostructures

A miniature room temperature formaldehyde sensor with high sensitivity and selectivity using CdSO₄ modified ZnO nanoparticles