A low temperature formaldehyde gas sensor based on hierarchical SnO/SnO2 nano-flowers assembled from ultrathin nanosheets: Synthesis, sensing performance and mechanism

Li, Na; Yu, Fan; Shi, Ying; Xiang, Qun; Wang, Xiaohong; Xu, Jiaqiang

doi:10.1016/j.snb.2019.04.061

Cited by 192 publications

(54 citation statements)

References 67 publications

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“…[26] SnO/SnO 2 nanoflowers 120 1000 n.a. [34] n.a. : not available Table Supplementary Material Click here to download Supplementary Material: Supplementary information.docx…”

Section: Resultsmentioning

confidence: 99%

Nanostructured tin oxide materials for the sub-ppm detection of indoor formaldehyde pollution

Sanchez

Sánchez-Sánchez

Izquierdo

et al. 2020

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Interesting sensing performances of indoor formaldehyde pollution were obtained when small amounts of zinc were introduced in tin oxides. Nanostructured Sn oxide-based porous materials doped with Zn or not, were synthesized using hydrothermal routes. The physicochemical properties of the as-prepared metal-oxide materials were characterized using nitrogen adsorption, X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Gas sensors were prepared using the aforementioned tin oxide materials and they exhibited a high sensitivity to formaldehyde at 230°C, as well as a good repeatability over the time. Their limit of formaldehyde detection was as low as 8 ppb in dry air and 50 ppb in air with 60% RH at 25°C. These results were much better that those reported in the open literature and they were attributed to both higher area BET, around 180 m 2 /g, and smaller crystallite size, 3.1 nm.

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“…[26] SnO/SnO 2 nanoflowers 120 1000 n.a. [34] n.a. : not available Table Supplementary Material Click here to download Supplementary Material: Supplementary information.docx…”

Section: Resultsmentioning

confidence: 99%

Nanostructured tin oxide materials for the sub-ppm detection of indoor formaldehyde pollution

Sanchez

Sánchez-Sánchez

Izquierdo

et al. 2020

Talanta

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“…The operating temperature has a crucial effect on the sensing properties of the gas sensor [33]. Many of metal-oxides or SiC-based gas sensors operate at high temperatures up to 600 • C, and typically encounter many challenging issues, such as thermal and long-term stability, sensitivity, reproducibility, and selectivity.…”

Section: Gas-sensor Characteristics With Ch 4 and Co Gasesmentioning

confidence: 99%

Fabrication of Gas-Sensor Chips Based on Silicon–Carbon Films Obtained by Electrochemical Deposition

et al. 2019

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In this study, we designed two types of gas-sensor chips with silicon–carbon film, doped with CuO, as the sensitive layer. The first type of gas-sensor chip consists of an Al2O3 substrate with a conductive chromium sublayer of ~10 nm thickness and 200 Ω/□ surface resistance, deposited by magnetron sputtering. The second type was fabricated via the electrochemical deposition of a silicon–carbon film onto a dielectric substrate with copper electrodes formed by photoelectrochemical etching. The gas sensors are sensitive to the presence of CO and CH4 impurities in the air at operating temperatures above 150 °C, and demonstrated p- (type-1) and n-type (type-2) conductivity. The type-1 gas sensor showed fast response and recovery time but low sensitivity, while the type-2 sensor was characterized by high sensitivity but longer response and recovery time. The silicon–carbon films were characterized by the presence of the hexagonal 6H SiC polytype with the impurities of the rhombohedral 15 R SiC phase. XRD analysis revealed the presence of a CuO phase.

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“…For example, triangle array or cross-linked network can be formed depending on the plasma etching time of PS spheres through the same processes: (i) self-assemble PS spheres, (ii) plasma etching of PS spheres, (iii) deposit MOS thin film, and (iv) remove PS spheres. Apart from creating more active adsorption sites, forming heterostructure to improve the sensing performance of MOS-based gas sensors has been intensively studied, which is a low cost, environmentalfriendly, and easy-to-implement method [25,[43][44][45][46][47][48]. The sputtering target can be designed by mixing two or more MOS elements, such as SnO 2 /NiO, SnO 2 /ZnO, SnO 2 / WO 3 , etc.…”

Section: Introductionmentioning

confidence: 99%

Sensitive Cross-Linked SnO2:NiO Networks for MEMS Compatible Ethanol Gas Sensors

et al. 2020

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Nowadays, it is still technologically challenging to prepare highly sensitive sensing films using microelectrical mechanical system (MEMS) compatible methods for miniaturized sensors with low power consumption and high yield. Here, sensitive cross-linked SnO 2 :NiO networks were successfully fabricated by sputtering SnO 2 :NiO target onto the etched self-assembled triangle polystyrene (PS) microsphere arrays and then ultrasonically removing the PS microsphere templates in acetone. The optimum line width (~600 nm) and film thickness (~50 nm) of SnO 2 :NiO networks were obtained by varying the plasma etching time and the sputtering time. Then, thermal annealing at 500°C in H 2 was implemented to activate and reorganize the as-deposited amorphous SnO 2 :NiO thin films. Compared with continuous SnO 2 :NiO thin film counterparts, these cross-linked films show the highest response of 9 to 50 ppm ethanol, low detection limits (< 5 ppm) at 300°C, and also high selectivity against NO 2 , SO 2 , NH 3 , C 7 H 8 , and acetone. The gas-sensing enhancement could be mainly attributed to the creating of more active adsorption sites by increased stepped surface in cross-linked SnO 2 :NiO network. Furthermore, this method is MEMS compatible and of generality to effectively fabricate other cross-linked sensing films, showing the promising potency in the production of low energy consumption and wafer-scale MEMS gas sensors.

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A low temperature formaldehyde gas sensor based on hierarchical SnO/SnO2 nano-flowers assembled from ultrathin nanosheets: Synthesis, sensing performance and mechanism

Cited by 192 publications

References 67 publications

Nanostructured tin oxide materials for the sub-ppm detection of indoor formaldehyde pollution

Nanostructured tin oxide materials for the sub-ppm detection of indoor formaldehyde pollution

Fabrication of Gas-Sensor Chips Based on Silicon–Carbon Films Obtained by Electrochemical Deposition

Sensitive Cross-Linked SnO2:NiO Networks for MEMS Compatible Ethanol Gas Sensors

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