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Abstract In this work, hollow MoO 3 microcages were triumphantly synthesized using a facile hydrothermal method without any template, and a possible growth mechanism of this microstructure arising from the co-effect of inside-out Ostward-ripening mechanism and the acidic etching was speculated. Subsequently, gas sensor based on such MoO 3 with hollow characteristic was fabricated to investigate the gas-sensing properties for ethanol as compared to solid MoO 3 polyhedrons. It was found that the hollow cages exhibited lager ethanol gas response than that of solid polyhedrons. The enhanced sensing behavior may originate from its unique hollow structures, leading to sufficient sensing reaction on the surface as well as abundant gas diffusion. Graphical abstract The hollow MoO 3 microcages were successfully synthesized via a simple hydrothermal method without any template. Such hollow structure based sensor presented enhanced gas response to ethanol than that of solid MoO 3 polyhedrons based sensor. The hollow nature led to sufficient sensing reaction on the surface as well as abundant gas diffusion. Image 1 Highlights • Hollow MoO 3 microcages were successfully synthesized. • The gas sensor based on the MoO 3 presented enhanced gas response to ethanol. • The hollow structure of the MoO 3 cages enhanced surface sensing reaction. [ABSTRACT FROM AUTHOR]

The NiO nanoflowers were prepared by a facile surfactant assisted hydrothermal method using Ni(NO 3 ) 2 –6H 2 O or NiCl 2 –6H 2 O as precursor compound. The microstructure of the samples was characterized by SEM and XRD. The gas sensing properties of the NiO nanoflowers toward ethanol was also investigated. The results show that surfactant plays a key role in the synthesis of flower-like NiO. The NiO nanoflowers show excellent sensing performances to ethanol gas. This morphology holds substantial promise for applying NiO as a potential gas sensing material for future sensor application. [ABSTRACT FROM AUTHOR]

Abstract: In this work we report microstructure and gas sensing property of the pristine SnO2 and (Ti,Sn)O2 solid solutions prepared via the hydrothermal method. Of all the examined volatile organic compound gases, the (Ti,Sn)O2 solid solution exhibits somewhat lower gas response as compared to that of pristine SnO2. Further, we perform a first principles calculation to establish a surface model for solid solution and estimate its atomic configuration. The tightness of Ti6C(Sn6C)O2C bond and high oxygen vacancy formation energy for solid solution suggest that less amount of pre-adsorbed oxygen was formed on the surface, ultimately resulting in sensing performance weakening. [Copyright &y& Elsevier]

Abstract: We report the microstructure and gas-sensing properties of La–TiO2 nanobelts prepared by the hydrothermal method. In particular, we make a comparison of the volatile organic compounds (VOCs) sensing properties between La–TiO2 nanobelts and La–TiO2 nanospheres. The results show that La–TiO2 nanobelts exhibit higher gas response as well as lower working temperature as compared to that of La–TiO2 nanospheres, suggesting that the gas sensing properties of nanocrystals can be significantly improved by tailoring the shape and the surface structure of nanocrystals. [Copyright &y& Elsevier]