Photo-enhanced gas sensing of SnS<sub>2</sub> with nanoscale defects

Yan, Wenjie; Chen, Dengyun; Fuh, Huei‐Ru; Li, Yinglan; Zhang, Duan; Liu, Huajun; Wu, Gang; Zhang, Lei; Ren, Xiang‐Kui; Cho, Jiung; Choi, Miri; Chun, Byong Sun; Coileáin, Cormac Ó; Xu, Hongjun; Wang, Zhi; Jiang, Zhaotan; Chang, Chih Shiang; Wu, Han‐Chun

doi:10.1039/c8ra08857h

Cited by 47 publications

(39 citation statements)

References 58 publications

(85 reference statements)

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“…The SnX 2 (X = S, Se)-based gas sensors show a good response to NO 2 at room temperature [6][7][8]. Furthermore, the SnSe 2 monolayer shows a higher sensitivity for NO 2 molecule adsorption than SnS 2 in our related work [7,8]. Also, the charge transfers and the flat band contributed by gas adsorption induces the conductivity difference of the SnSe 2 monolayer reported in our previous study [8].…”

Section: Introductionsupporting

confidence: 50%

“…The layered SnX 2 (X = S, Se) nanosheets show a significant sensitivity to individual molecules, such as NO 2 and NH 3 [3,[6][7][8]. The SnX 2 (X = S, Se)-based gas sensors show a good response to NO 2 at room temperature [6][7][8]. Furthermore, the SnSe 2 monolayer shows a higher sensitivity for NO 2 molecule adsorption than SnS 2 in our related work [7,8].…”

Section: Introductionmentioning

confidence: 53%

“…2D-TMDs materials have been applied as gas sensors due to their large surface-area-to-bulk ratio. The layered SnX 2 (X = S, Se) nanosheets show a significant sensitivity to individual molecules, such as NO 2 and NH 3 [3,[6][7][8]. The SnX 2 (X = S, Se)-based gas sensors show a good response to NO 2 at room temperature [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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First-Principles Study for Gas Sensing of Defective SnSe2 Monolayers

2020

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We report the interaction between gas molecules (NO2 and NH3) and the SnSe2 monolayers with vacancy and dopants (O and N) for potential applications as gas sensors. Compared with the gas molecular adsorbed on pristine SnSe2 monolayer, the Se-vacancy SnSe2 monolayer obviously enhances sensitivity to NO2 adsorption. The O-doped SnSe2 monolayer shows similar sensitivity to the pristine SnSe2 monolayer when adsorbing NO2 molecule. However, only the N-doped SnSe2 monolayer represents a visible enhancement for NO2 and NH3 adsorption. This work reveals that the selectivity and sensitivity of SnSe2-based gas sensors could be improved by introducing the vacancy or dopants.

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Section: Introductionsupporting

confidence: 50%

Section: Introductionmentioning

confidence: 53%

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First-Principles Study for Gas Sensing of Defective SnSe2 Monolayers

2020

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“…Zhang et al have demonstrated a self-assembled SnS 2 nanoflower/Zn 2 SnO 4 hollow sphere nanohybrid device, exhibiting excellent humidity sensing properties 20 . Recently, Yan et al fabricated NO 2 gas sensor based on CVD grown SnS 2 with ultra-high sensitivity by utilizing inherent defects under photoillumination 21 . Although, there are many reports on SnS 2 based devices for humidity and gas sensing, the quest is always on for fabrication of devices with properties such as large area with simple designs, self-powered, ultrasensitive and room temperature humidity sensing.…”

mentioning

confidence: 99%

“…There are several techniques to obtain low-dimensional SnS 2 thin films. Exfoliation, chemical vapour deposition (CVD), hydrothermal and solvothermal synthesis, and sputtering have been extensively used for fabricating nanofilm based devices [20][21][22][23][24] . However, exfoliation of nanoflakes and growth of thin films by CVD result in thin films whose sizes are in the range of few μm, thus hindering the large-scale growth optimum for industrial scale applications.…”

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Self-powered, ultrasensitive, room temperature humidity sensors using SnS2 nanofilms

Rambabu¹,

Singh

Pant

et al. 2020

Sci Rep

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Humidity monitoring has become extremely vital in various technological fields such as environment control, biomedical engineering, and so on. therefore, a substantial interest lies in the development of fast and highly sensitive devices with high figures of merit. Self-powered and ultrasensitive humidity sensors based on SnS 2 nanofilms of different film thicknesses have been demonstrated in this work. The sensing behavior has been investigated in the relative humidity (RH) range of 2-99%. The observed results reveal a remarkable response and ultrafast detection even with zero applied bias (self-powered mode), with response and recovery times of ~ 10 and ~ 0.7 s, respectively. The self-powered behavior has been attributed to the inhomogeneities and the asymmetry in the contact electrodes. The highest sensitivity of ~ 5.64 × 10 6 % can be achieved at an applied bias of 5 V. This approach of fabricating such highly responsive, self-powered and ultrafast sensors with simple device architectures will be useful for designing futuristic sensing devices.

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Highly Sensitive, Selective, Stable, and Flexible NO₂ Sensor Based on GaSe

Zhao

Fuh

Coileáin

et al. 2020

Adv Materials Technologies

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Air pollution is a global problem, which poses serious environmental concerns and health risks. In light of this, a key aspect of the challenge of managing air pollution is effective monitoring, which requires reliable high‐sensitivity sensors with strong selectivity and long‐term stability. Layered materials represent an emergent class of materials with extraordinary electronic properties and physicochemical properties, and, therefore, are a highly attractive prospect for this field. Here, such a sensor for NO2 based on GaSe is presented. An ultrahigh sensitivity of 0.5 part per billion (p.p.b.) is achieved at room temperature, and the NO2 selectivity ratios with respect to other likely interfering environmental gases are larger than 100. Moreover, no great degradation is observed after 10 days of air exposure. As a practical demonstration, the GaSe‐based sensors are also used to detect vehicle exhaust emission, and wearable GaSe‐based NO2 sensors are presented and tested. Based on the results obtained in this work, it is believed that GaSe‐based sensors can be used for the detection of NO2 in real‐world applications.

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Photo-enhanced gas sensing of SnS₂ with nanoscale defects

Abstract: A photon assisted SnS2-based gas sensor with an ultra-high sensitivity of 3 ppb NO2 has been achieved at room temperature.

Cited by 47 publications

References 58 publications

First-Principles Study for Gas Sensing of Defective SnSe2 Monolayers

First-Principles Study for Gas Sensing of Defective SnSe2 Monolayers

Self-powered, ultrasensitive, room temperature humidity sensors using SnS2 nanofilms

Highly Sensitive, Selective, Stable, and Flexible NO₂ Sensor Based on GaSe

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Photo-enhanced gas sensing of SnS2 with nanoscale defects

Abstract: A photon assisted SnS2-based gas sensor with an ultra-high sensitivity of 3 ppb NO2 has been achieved at room temperature.

Cited by 47 publications

References 58 publications

First-Principles Study for Gas Sensing of Defective SnSe2 Monolayers

First-Principles Study for Gas Sensing of Defective SnSe2 Monolayers

Self-powered, ultrasensitive, room temperature humidity sensors using SnS2 nanofilms

Highly Sensitive, Selective, Stable, and Flexible NO2 Sensor Based on GaSe

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Product

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Photo-enhanced gas sensing of SnS₂ with nanoscale defects

Highly Sensitive, Selective, Stable, and Flexible NO₂ Sensor Based on GaSe