Formaldehyde detection: SnO2 microspheres for formaldehyde gas sensor with high sensitivity, fast response/recovery and good selectivity

Li, Yuxiu; Chen, Nan; Deng, Dongyang; Xing, Xinxin; Xiao, Xuechun; Wang, Yude

doi:10.1016/j.snb.2016.07.051

Cited by 296 publications

(119 citation statements)

References 47 publications

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“…These gas sensors exhibited unique performances, including a low-cost, small size, and fast response and recovery time. SnO 2 , a typical n-type metal-oxide semiconductor with a rutile crystalline structure, is widely used to detect different kinds of gases such as ethanol [14], formaldehyde [15], acetone [16], nitrogen dioxide [17], etc. These are all due to their remarkable characteristics such as their good chemical and physical stability, non-pollution property, low-energy feature, use of simple preparation, and so on.…”

Section: Introductionmentioning

confidence: 99%

Calcination Method Synthesis of SnO2/g-C3N4 Composites for a High-Performance Ethanol Gas Sensing Application

et al. 2017

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The SnO2/g-C3N4 composites were synthesized via a facile calcination method by using SnCl4·5H2O and urea as the precursor. The structure and morphology of the as-synthesized composites were characterized by the techniques of X-ray diffraction (XRD), the field-emission scanning electron microscopy and transmission electron microscopy (SEM and TEM), energy dispersive spectrometry (EDS), thermal gravity and differential thermal analysis (TG-DTA), and N2-sorption. The analysis results indicated that the as-synthesized samples possess the two dimensional structure. Additionally, the SnO2 nanoparticles were highly dispersed on the surface of the g-C3N4nanosheets. The gas-sensing performance of the as-synthesized composites for different gases was tested. Moreover, the composite with 7 wt % g-C3N4 content (SnO2/g-C3N4-7) SnO2/g-C3N4-7 exhibits an admirable gas-sensing property to ethanol, which possesses a higher response and better selectivity than that of the pure SnO2-based sensor. The high surface area of the SnO2/g-C3N4 composite and the good electronic characteristics of the two dimensional graphitic carbon nitride are in favor of the elevated gas-sensing property.

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Section: Introductionmentioning

confidence: 99%

Calcination Method Synthesis of SnO2/g-C3N4 Composites for a High-Performance Ethanol Gas Sensing Application

et al. 2017

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“…Yong et al studied that the recovery times of NO and NO 2 on the graphitic GaN sheets were 1.1 μs and 0.16 ms, respectively [77]. Li et al reported that the recovery time of SnO 2 microspheres for a HCHO sensor was 25 s [78]. Therefore, it suggests that the NH 2 -(5,0) BNNT has the good potential to act as a room temperature gas sensor with relative short recovery time.…”

Section: Recovery Time and Desorption Energymentioning

confidence: 99%

Adsorption of NO₂, HCN, HCHO and CO on pristine and amine functionalized boron nitride nanotubes by self-consistent charge density functional tight-binding method

Timsorn

Wongchoosuk

2020

Mater. Res. Express

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The adsorptions of toxic gases including NO 2 , HCN, HCHO and CO molecules on the pristine and amine functionalized (5,0) single-wall boron nitride nanotubes (BNNTs) are investigated based on self-consistent charge density functional tight-binding (SCC-DFTB) method. The calculated results indicate that the pristine (5,0) BNNT exhibits weak adsorption for the gas molecules. Based on the calculated adsorption energy, interaction distances and charge transfer, amine functionalization at a boron atom of the pristine (5,0) BNNT enhances the sensitivity of the pristine (5,0) BNNT toward the gas molecules. The electronic densities of state results reveal that new local states in the vicinity of Fermi level for adsorption between amine functionalized BNNT and the gas molecules significantly appear. This confirms the improved sensitivity of the pristine (5,0) BNNT functionalized with amine for adsorption of the toxic gases. This study is expected to provide a useful guidance on gas sensing application of pristine and amine functionalized BNNTs for detection of the toxic gases at room temperature. [3,31]. Also, previous theoretical studies showed that the interaction between gas molecules and BNNTs doped with metals at boron atoms was stronger than N atom of the nanotubes [3,32].Covalent/noncovalent functionalization on BNNT surfaces can improve the electronic properties of BNNTs for gas sensor applications [22,[33][34][35]. The previous studies reported that the band structures of BNNTs may be changed by chemical functionalization [36,37]. To the best of our knowledge, the reports about BNNTs functionalized with amine groups (NH 2 ) for adsorption of toxic gases are less available. Based on these motivations, we thus present the study of sensor performances of pristine (5,0) single-walled BNNT (pristine (5,0) BNNT) and amine functionalized (5,0) single-walled BNNT (NH 2 -(5,0) BNNT) for adsorption of important dangerous NO 2 , HCN, HCHO and CO gases using self-consistent charge density functional tight-binding (SCC-DFTB) method including van der Waals dispersion corrections. These gas molecules are chosen because they are the most common air pollutants that usually cause harm to human health and ecosystem. The air pollutions are generated from car engines, factories, power plants, human activity and natural processes [38,39], i.e., typical internal car combustion engine produces high concentrations of CO when fuels burn incompletely. Internal combustion engines and the use of gas stoves for cooking also produce NO 2 . The HCN is released from combustion of organic matter, building fires, cigarettes or car exhaust fumes while HCHO is found from furniture, cosmetics, cleaning products, glues, paints as well as contaminants in seafood [40]. Therefore, new sensing materials for detection of these air pollutions are still important. The results of this study are attributed to provide useful information and guidance for gas sensor designs in future experiments. Calculation methodThe SCC-DFTB method is based on a second-order ex...

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“…However, as a typical gas sensing material, pure SnO 2 with a wide band gap (3.6 eV) has a higher operating temperature, which restricts its application for gas detection. 22,[25][26][27] Therefore, the optimal operation temperature of a sensor for detecting gases is signicant. In this work, it can be observed in Fig.…”

Section: Gas Sensing Measurementsmentioning

confidence: 99%

“…6,33 Therefore, 130 C is the optimal operating temperature of the MLTPS sensor; this optimal operating temperature is obviously lower than those in numerous reported studies (higher operating temperatures from 200 C to 600 C). 22,[25][26][27] Here, the low operating temperature (130 C) is due to the fact that MLTPS has abundant active sites, a large surface-to-volume ratio and numerous gas diffusion channels, which results in a faster adsorption/desorption rate. Reasonably, the subsequent gas sensing measurements were conducted at the optimal operating temperature (130 C).…”

Section: Gas Sensing Measurementsmentioning

confidence: 99%

“…However, most semiconducting metal oxide-based HCHO sensors still contain defects. For example, they generally demand higher operating temperatures, from 200 C to 600 C, 22,[25][26][27] and show low selectivity. [26][27][28] In order to avoid the challenges of composition modication and overcome the limits of structure optimization, in this work, we combined chemosynthesis with biomimetic techniques to fabricate novel multi-level tubes/pores SnO 2 (MLTPS).…”

Section: Introductionmentioning

confidence: 99%

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A highly sensitive gas sensor employing biomorphic SnO₂with multi-level tubes/pores structure: bio-templated from waste of flax

et al. 2019

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Formaldehyde detection: SnO2 microspheres for formaldehyde gas sensor with high sensitivity, fast response/recovery and good selectivity

Cited by 296 publications

References 47 publications

Calcination Method Synthesis of SnO2/g-C3N4 Composites for a High-Performance Ethanol Gas Sensing Application

Calcination Method Synthesis of SnO2/g-C3N4 Composites for a High-Performance Ethanol Gas Sensing Application

Adsorption of NO₂, HCN, HCHO and CO on pristine and amine functionalized boron nitride nanotubes by self-consistent charge density functional tight-binding method

A highly sensitive gas sensor employing biomorphic SnO₂with multi-level tubes/pores structure: bio-templated from waste of flax

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Formaldehyde detection: SnO2 microspheres for formaldehyde gas sensor with high sensitivity, fast response/recovery and good selectivity

Cited by 296 publications

References 47 publications

Calcination Method Synthesis of SnO2/g-C3N4 Composites for a High-Performance Ethanol Gas Sensing Application

Calcination Method Synthesis of SnO2/g-C3N4 Composites for a High-Performance Ethanol Gas Sensing Application

Adsorption of NO2, HCN, HCHO and CO on pristine and amine functionalized boron nitride nanotubes by self-consistent charge density functional tight-binding method

A highly sensitive gas sensor employing biomorphic SnO2with multi-level tubes/pores structure: bio-templated from waste of flax

Contact Info

Product

Resources

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Adsorption of NO₂, HCN, HCHO and CO on pristine and amine functionalized boron nitride nanotubes by self-consistent charge density functional tight-binding method

A highly sensitive gas sensor employing biomorphic SnO₂with multi-level tubes/pores structure: bio-templated from waste of flax