Room-temperature gas sensor based on in situ grown, etched and W-doped ZnO nanotubes functionalized with Pt nanoparticles for the detection of low-concentration H2S

Xuan, Jingyue; Wang, Li; Zou, Yecheng; Li, Yongzhe; Zhang, Haifeng; Qi, Lü; Sun, Meiling; Yin, Guangchao; Zhou, Aoying

doi:10.1016/j.jallcom.2022.166158

Cited by 29 publications

(3 citation statements)

References 66 publications

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“…The O 1s spectra consists of three peaks at 529.8, 531.2 and 532.5 eV (figure 3(e)), which represent Ti-O-Ti, Ti-OH, C-O bonds, respectively [37]. With regard to the Pt 4f spectra (figure 3(f)), two stronger peaks with an energy gap of 3.3 eV are detected at 70.3 and 73.6 eV, which can be ascribed to Pt 4f 7/2 and Pt 4f 5/2 of metallic Pt°, respectively [38]. In addition, the other two smaller peaks located at 71.2 and 74.5 eV are associated with the PtO [23,39].…”

Section: Resultsmentioning

confidence: 96%

Enhanced ammonia sensing response based on Pt-decorated Ti₃C₂T _x /TiO₂ composite at room temperature

Zhang¹,

Wang²,

Zou³

et al. 2023

Nanotechnology

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Herein, we report a Pt-decorated Ti3C2Tx/TiO2 gas sensor for the enhanced NH3 sensing response at room temperature. Firstly, the TiO2 nanosheets (NSs) are in-situ grown onto the two-dimensional (2D) Ti3C2Tx by hydrothermal treatment. Similar to Ti3C2Tx sensor, the Ti3C2Tx/TiO2 sensor has a positive resistance variation upon exposure to NH3, but with slight enhancement in response. However, after the loading of Pt nanoparticles (NPs), the Pt-Ti3C2Tx/TiO2 sensor shows a negative response with significantly improved NH3 sensing performance. The shift in response direction indicates that the dominant sensing mechanism has changed under the sensitization effect of Pt NPs. At room temperature, the response of Pt-Ti3C2Tx/TiO2 gas sensor to 100 ppm NH3 is about 45.5%, which is 13.8- and 10.8- times higher than those of Ti3C2Tx and Ti3C2Tx/TiO2 gas sensors, respectively. The experimental detection limit of the Pt-Ti3C2Tx/TiO2 gas sensor to detect NH3 is 10 ppm, and the corresponding response is 10.0%. In addition, the Pt-Ti3C2Tx/TiO2 gas sensor shows the fast response/recovery speed (23/34 s to 100 ppm NH3), high selectivity and good stability. Considering both the response value and the response direction, the corresponding gas-sensing mechanism is also deeply discussed. This work is expected to shed a new light on the development of noble metals decorated MXene-metal oxide gas sensors.

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Section: Resultsmentioning

confidence: 96%

Enhanced ammonia sensing response based on Pt-decorated Ti₃C₂T _x /TiO₂ composite at room temperature

Zhang¹,

Wang²,

Zou³

et al. 2023

Nanotechnology

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“…The effect of noble metal functionalization can be explained by a combination of electronic and chemical sensitization [ 40 ]. For chemical sensitization, the active sites of noble metals on the surface of the metal oxide semiconductor are catalytically active for specific gases [ 41 ].…”

Section: Resultsmentioning

confidence: 99%

Influence of Different Pt Functionalization Modes on the Properties of CuO Gas-Sensing Materials

Chen,

Liu,

Ouyang

et al. 2023

Sensors

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The functionalization of noble metals is an effective approach to lowering the sensing temperature and improving the sensitivity of metal oxide semiconductor (MOS)-based gas sensors. However, there is a dearth of comparative analyses regarding the differences in sensitization mechanisms between the two functionalization modes of noble metal loading and doping. In this investigation, we synthesized Pt-doped CuO gas-sensing materials using a one-pot hydrothermal method. And for Pt-loaded CuO, Pt was deposited on the synthesized pristine CuO surface by using a dipping method. We found that both functionalization methods can considerably enhance the response and selectivity of CuO toward NO2 at low temperatures. However, we observed that CuO with Pt loading had superior sensing performance at 25 °C, while CuO with Pt doping showed more substantial response changes with an increase in the operating temperature. This is mainly due to the different dominant roles of electron sensitization and chemical sensitization resulting from the different forms of Pt present in different functionalization modes. For Pt doping, electron sensitization is stronger, and for Pt loading, chemical sensitization is stronger. The results of this study present innovative ideas for understanding the optimization of noble metal functionalization for the gas-sensing performance of metal oxide semiconductors.

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“…In the above XPS results, the total amount including the oxygen vacancy and adsorbed oxygen of 2.92 wt% Pt-SnO 2 is the largest, which further confirms this inference. Because the good dispersion of Pt particles in SnO 2 nanoparticles plays an important role [79], higher Pt loading leads to the aggregation of PtO and Pt nanoparticles on the surface of SnO 2 nanoparticles, hindering their sufficient contact with SnO 2 nanoparticles and also reducing the exposed area for oxygen adsorption, thereby weakening the enhancement of gas-sensing performance [96,97]. At present, the mechanism of Pt-loading improving gas sensitivity can only be testified by the proportion of oxygen vacancy and adsorbed oxygen.…”

Section: Gas Sensing Mechanismmentioning

confidence: 99%

Enhanced toluene gas-sensing properties of MEMS sensor based on Pt-loaded SnO₂ nanoparticles

et al. 2023

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Rapid detection of low concentration toluene is highly desirable in environment monitoring, industrial processes, medical diagnosis, etc. In this study, we prepared the Pt-loaded monodispersed nanoparticles through hydrothermal synthesis and assembled a toluene sensor with fast response and low detection limits based on Micro-Electro-Mechanical System (MEMS). Compared with the pure SnO2, the 3 wt% Pt-loaded SnO2 sensor exhibits a 2.75 times higher gas sensitivity to toluene gas at about 330 °C. Meanwhile, the 3 wt% Pt-loaded SnO2 sensor also has a stable and good response to 100 ppb of toluene. Its theoretical detection limit was calculated as low as 12.6 ppb. Also, the sensor has a short response time of ~10 s at different gas concentrations (even down to 5.4 s at 20 ppm), as well as the excellent dynamic response-recover characteristic, selectivity, and stability. The improved performance of Pt-loaded SnO2 sensor can be explained by the increase of oxygen vacancies and chemisorbed oxygen. In our MEMS sensors, three gas sensing elements could be packaged in one ceramic shell for parallel testing and made it easier for real application by embedding in a printed circuit board. This provides new ideas and decent prospect for developing miniaturized, low-power-comsumption, and portable application of gas sensing devices.

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Room-temperature gas sensor based on in situ grown, etched and W-doped ZnO nanotubes functionalized with Pt nanoparticles for the detection of low-concentration H2S

Cited by 29 publications

References 66 publications

Enhanced ammonia sensing response based on Pt-decorated Ti₃C₂T _x /TiO₂ composite at room temperature

Enhanced ammonia sensing response based on Pt-decorated Ti₃C₂T _x /TiO₂ composite at room temperature

Influence of Different Pt Functionalization Modes on the Properties of CuO Gas-Sensing Materials

Enhanced toluene gas-sensing properties of MEMS sensor based on Pt-loaded SnO₂ nanoparticles

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Room-temperature gas sensor based on in situ grown, etched and W-doped ZnO nanotubes functionalized with Pt nanoparticles for the detection of low-concentration H2S

Cited by 29 publications

References 66 publications

Enhanced ammonia sensing response based on Pt-decorated Ti3C2T x /TiO2 composite at room temperature

Enhanced ammonia sensing response based on Pt-decorated Ti3C2T x /TiO2 composite at room temperature

Influence of Different Pt Functionalization Modes on the Properties of CuO Gas-Sensing Materials

Enhanced toluene gas-sensing properties of MEMS sensor based on Pt-loaded SnO2 nanoparticles

Contact Info

Product

Resources

About

Enhanced ammonia sensing response based on Pt-decorated Ti₃C₂T _x /TiO₂ composite at room temperature

Enhanced ammonia sensing response based on Pt-decorated Ti₃C₂T _x /TiO₂ composite at room temperature

Enhanced toluene gas-sensing properties of MEMS sensor based on Pt-loaded SnO₂ nanoparticles