ZnO twin-rods decorated with Pt nanoparticles for butanone detection

Author(s)

Oliveira, Tais N. T. ; Zito, Cecilia A. ; Perfecto, Tarcisio M. ; Azevedo, Gustavo M. ; Volanti, Diogo P.

• Document type: Journal article
• Source: NEW JOURNAL OF CHEMISTRY; v. 44, n. 36, p. 10-pg., 2020-09-28.

Abstract

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-rodsviaa 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 degrees 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. (AU)

• FAPESP's process: 19/12345-9 - ZnO sensors modified with Mn3O4 or In2O3 obtained by combining the ultrasonic spray and hydrothermal microwave assisted methods
• Grantee: Taís Nascimento Teixeira Oliveira
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 18/00033-0 - Sensing devices of volatile organic compounds based on ZnO hollow/p-type semiconductors heterostructures
• Grantee: Tarcísio Micheli Perfecto
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/25267-8 - Graphene acid composites with hollow CeO2 and Pd-CeO2 yolk-shell structures applied as volatile organic compounds sensors
• Grantee: Cecilia de Almeida Zito
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 16/22219-2 - Microwave-assisted hydrothermal synthesis of the zinc oxide decored with platinum nanoparticles for volatile organic compounds detection
• Grantee: Taís Nascimento Teixeira Oliveira
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• FAPESP's process: 17/01267-1 - Graphene acid-hollow metal oxides composites for gas sensor
• Grantee: Diogo Paschoalini Volanti
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/01258-5 - Novel chemical catalytic and photocatalytic processes for the direct conversion of methane and CO2 to products
• Grantee: José Maria Correa Bueno
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 13/23886-4 - Study on selectivity of hydrogenolysis / reductive hydrogenation processes of sugarcane bagasse under supercritical state catalyzed by structured metal oxides
• Grantee: Mauricio Boscolo
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Regular Program Grants