Nano

SKKU Advanced Institute of Nano Technology (성균관대학교 성균나노과학기술원)
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Synthesis of Au Nanoparticles Functionalized 1D α-MoO3 Nanobelts and Their Gas Sensing Properties

  • Wang, Liwei (School of Marine Sciences Guangxi University) ;
  • Wang, Shaopeng (School of Marine Sciences Guangxi University) ;
  • Fu, Hao (School of Marine Sciences Guangxi University) ;
  • Wang, Yinghui (School of Marine Sciences Guangxi University) ;
  • Yu, Kefu (School of Marine Sciences Guangxi University)
  • Received : 2018.07.06
  • Accepted : 2018.08.29
  • Published : 2018.10.31
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Abstract

A novel sensor material of Au nanoparticles (NPs) functionalized 1D ${\alpha}-MoO_3$ nanobelts (NBs) was fabricated by a facile lysine-assisted approach. The obtained $Au/{\alpha}-MoO_3$ product was characterized by means of X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray (EDX), and X-ray photoelectron spectra (XPS). Then, in order to investigate the gas sensing performances of our samples, a comparative gas sensing study was carried out on both the ${\alpha}-MoO_3$ NBs before and after Au NPs decoration by using ethanol vapor as the molecular probe. The results turned out that, after the functionalization of Au NPs, the sensor exhibited improved gas-sensing characteristics than the pure ${\alpha}-MoO_3$, such as response and recovery time, optimal operating temperature (OT) and excellent selectivity. Take for example 200 ppm of ethanol, the response/recovery times were 34 s/43 s and 5.7 s/10.5 s, respectively, while the optimal operating temperature (OT) was lower to $200^{\circ}C$ rather than $250^{\circ}C$. Besides, the functionalized sensor showed a higher response to ethanol at $200^{\circ}C$, and response was 1.6 times higher than the pure $MoO_3$. The mechanism of such improved sensing properties was interpreted, which might be attributed to the spillover effect of Au NPs and the electronic metal-support interaction.

Keywords

Acknowledgement

Supported by : National Natural Science Foundation of China, BaGui Scholars Program Foundation, Natural Science Foundation of Guangxi Province

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