Ultrafine nanoparticles of W-doped SnO<sub>2</sub>for durable H<sub>2</sub>S sensors with fast response and recovery

Wang, Pengjian; Hui, Junfeng; Yuan, Tingbiao; Chen, Peng; Su, Yue; Liang, Wenjie; Chen, Fulin; Zheng, Xiaoyan; Zhao, Yuxin; Hu, Shengsun

doi:10.1039/c9ra00944b

Cited by 22 publications

(7 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The performance of our top-down fabricated H 2 S sensor is highly competitive with the previously reported n-type MOS H 2 S sensor studies. Figure f,g shows the response signal and response speed of the previous SnO 2 -based H 2 S sensors, indicating that our top-down fabricated SnO 2 and SnO 2 –NiO nanopattern sensors show superior performances in terms of both sensitivity and reaction speed. ,− Especially, our sensors show at least 1 or 2 orders of magnitude higher signals that other sensors and tens of seconds faster response speeds. Furthermore, our SnO 2 –NiO nanopattern also shows among the best performance in terms of sensitivity, speed, and detection range when compared with WO 3 -based H 2 S sensor (Table S1).…”

Section: Resultsmentioning

confidence: 71%

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H₂S Detection

et al. 2022

View full text Add to dashboard Cite

Metal oxide semiconductors (MOS) have proven to be most powerful sensing materials to detect hydrogen sulfide (H 2 S), achieving part per billion (ppb) level sensitivity and selectivity. However, there has not been a way of extending this approach to the top-down H 2 S sensor fabrication process, completely limiting their commercial-level productions. In this study, we developed a top-down lithographic process of a 10 nm-scale SnO 2 nanochannel for H 2 S sensor production. Due to high-resolution (15 nm thickness) and high aspect ratio (>20) structures, the nanochannel exhibited highly sensitive H 2 S detection performances (R a /R g = 116.62, τ res = 31 s at 0.5 ppm) with selectivity (R Hd 2 S /R acetone = 23 against 5 ppm acetone). In addition, we demonstrated that the nanochannel could be efficiently sensitized with the p−n heterojunction without any postmodification or an additional process during one-step lithography. As an example, we demonstrated that the H 2 S sensor performance can be drastically enhanced with the NiO nanoheterojunction (R a /R g = 166.2, τ res = 21 s at 0.5 ppm), showing the highest range of sensitivity demonstrated to date for state-of-the-art H 2 S sensors. These results in total constitute a high-throughput fabrication platform to commercialize the H 2 S sensor that can accelerate the development time and interface in real-life situations.

show abstract

Section: Resultsmentioning

confidence: 71%

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H₂S Detection

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The NaPt-WO 3 NF–based sensors also featured outstanding reliability without much degradation in the response values throughout repeated exposure to each of 1 ppm of H 2 S and 400 ppb H 2 S, respectively (Figure e and SI Figure S11). Among the state-of-the-art publications on SMO-based H 2 S sensors, our NaPt-WO 3 NF–based sensors exhibit, to the best of our knowledge, some of the best sensing properties (Figure f and Table ,,,− ).…”

Section: Resultsmentioning

confidence: 78%

Surface Activity-Tuned Metal Oxide Chemiresistor: Toward Direct and Quantitative Halitosis Diagnosis

et al. 2021

View full text Add to dashboard Cite

Continuous monitoring of hydrogen sulfide (H2S) in human breath for early stage diagnosis of halitosis is of great significance for prevention of dental diseases. However, fabrication of a highly selective and sensitive H2S gas sensor material still remains a challenge, and direct analysis of real breath samples has not been properly attempted, to the best of our knowledge. To address the issue, herein, we introduce facile cofunctionalization of WO3 nanofibers with alkaline metal (Na) and noble metal (Pt) catalysts via the simple addition of sodium chloride (NaCl) and Pt nanoparticles (NPs), followed by electrospinning process. The Na-doping and Pt NPs decoration in WO3 grains induces the partial evolution of the Na2W4O13 phase, causing the buildup of Pt/Na2W4O13/WO3 multi-interface heterojunctions that selectively interacts with sulfur-containing species. As a result, we achieved the highest-ranked sensing performances, that is, response (R air/R gas) = 780 @ 1 ppm and selectivity (R H2S/R EtOH) = 277 against 1 ppm ethanol, among the chemiresistor-based H2S sensors, owing to the synergistic chemical and electronic sensitization effects of the Pt NP/Na compound cocatalysts. The as-prepared sensing layer was proven to be practically effective for direct, and quantitative halitosis analysis based on the correlation (accuracy = 86.3%) between the H2S concentration measured using the direct breath signals obtained by our test device (80 cases) and gas chromatography. This study offers possibilities for direct, highly reliable and rapid detection of H2S in real human breath without the need of any collection or filtering equipment.

show abstract

“…In addition, the well-developed lattice fringes imply a high degree of crystallinity and random orientation; lattice fringes with interplanar spacings of 0.334 nm and 0.267 nm correspond to the (110) and (101) planes of rutile SnO 2 , respectively. 40 The four diffraction rings of the SAED pattern shown in the inset correspond to the (110), ( 101), (211), and (112) planes, conrming the tetragonal rutile structure of the SnO 2 nanowires. Fig.…”

Section: Materials Characterizationmentioning

confidence: 99%

Co,N-doped GQDs/SnO₂ mesoporous microspheres exhibit synergistically enhanced gas sensing properties for H₂S gas detection

et al. 2022

View full text Add to dashboard Cite

show abstract

Ultrafine nanoparticles of W-doped SnO₂for durable H₂S sensors with fast response and recovery

Abstract: 5% W-doped SnO2 HRTEM, long-term stability and schematic image.

Cited by 22 publications

References 50 publications

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H₂S Detection

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H₂S Detection

Surface Activity-Tuned Metal Oxide Chemiresistor: Toward Direct and Quantitative Halitosis Diagnosis

Co,N-doped GQDs/SnO₂ mesoporous microspheres exhibit synergistically enhanced gas sensing properties for H₂S gas detection

Contact Info

Product

Resources

About

Ultrafine nanoparticles of W-doped SnO2for durable H2S sensors with fast response and recovery

Abstract: 5% W-doped SnO2 HRTEM, long-term stability and schematic image.

Cited by 22 publications

References 50 publications

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H2S Detection

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H2S Detection

Surface Activity-Tuned Metal Oxide Chemiresistor: Toward Direct and Quantitative Halitosis Diagnosis

Co,N-doped GQDs/SnO2 mesoporous microspheres exhibit synergistically enhanced gas sensing properties for H2S gas detection

Contact Info

Product

Resources

About

Ultrafine nanoparticles of W-doped SnO₂for durable H₂S sensors with fast response and recovery

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H₂S Detection

Top-Down Approaches for 10 nm-Scale Nanochannel: Toward Exceptional H₂S Detection

Co,N-doped GQDs/SnO₂ mesoporous microspheres exhibit synergistically enhanced gas sensing properties for H₂S gas detection