ZnO twin-rods decorated with Pt nanoparticles for butanone detection

• Autor(a) principal: Oliveira, Taís N.T. [UNESP]
• Data de Publicação: 2020
• Outros Autores: Zito, Cecilia A. [UNESP], Perfecto, Tarcísio M. [UNESP], Azevedo, Gustavo M., Volanti, Diogo P. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1039/d0nj03206a; http://hdl.handle.net/11449/205366

Sensors of volatile organic compounds (VOCs) are of great importance for environmental monitoring. Nevertheless, it is a great challenge to develop highly sensitive and selective sensors. In this sense, we report the synthesis of ZnO twin-rods via a combination of the ultrasonic spray nozzle and microwave-assisted hydrothermal methods, which were then loaded with platinum (Pt) nanoparticles (NPs) to obtain Pt/ZnO heterostructures. The VOC detection tests revealed that the 2% Pt/ZnO heterostructure was the best composition, which showed an improved response of 35.2 to 100 ppm of butanone at 450 °C, with high sensitivity to detect low concentrations of butanone (5 ppm) as well as high selectivity and stability. X-ray absorption spectroscopy studies revealed the presence of oxidized Pt species (PtOx) under optimal operating conditions. Thus, the enhanced sensitivity of 2% Pt/ZnO can be attributed to the p-n junction at the PtOx/ZnO interface.