Low-operating temperature and remarkably responsive methanol sensors using Pt-decorated hierarchical ZnO structure
Nguyen Minh Vuong1, Do Dai Duy1, Hoang Nhat Hieu1
1Faculty of Natural Sciences, Quy Nhon University, 170 An Duong Vuong, Quy Nhon, Binh Dinh 590000, Vietnam.
Nanotechnology
|October 15, 2021
Summary
Platinum nanoparticles enhance zinc oxide nanorod sensors for highly responsive, low-temperature methanol detection. This breakthrough offers significantly improved sensitivity and optimal operating temperatures for gas sensing applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Development of highly responsive methanol sensors is crucial for various industrial and environmental applications.
- Existing sensors often require high operating temperatures, limiting their efficiency and applicability.
- Hierarchical nanostructures offer enhanced surface area and unique properties for improved sensing capabilities.
Purpose of the Study:
- To develop highly responsive methanol sensors utilizing hierarchical zinc oxide (ZnO) nanorods decorated with platinum (Pt) nanoparticles.
- To investigate the effect of Pt nanoparticle decoration on the methanol sensing performance at low temperatures.
- To propose a sensing mechanism for the Pt/ZnO nanostructure.
Main Methods:
- Fabrication of hierarchical ZnO nanorods on ZnO nanofibers via electrospinning and hydrothermal growth.
- Decoration of ZnO nanorods with Pt nanoparticles using UV-assisted deposition.
- Characterization using field-effect scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-Vis absorption spectroscopy, and electrical measurements.
- Methanol sensing performance evaluation at various working temperatures (110 °C–260 °C).
Main Results:
- Pt nanoparticle decoration significantly enhanced the methanol sensing response of hierarchical ZnO nanorods, achieving a ~19,500-fold increase compared to unmodified sensors.
- The Pt/ZnO sensors exhibited optimal performance at lower working temperatures, in the range of 140 °C–200 °C.
- Characterization confirmed the successful synthesis of hierarchical Pt/ZnO nanostructures with specific morphology and composition.
Conclusions:
- Hierarchical ZnO nanorods decorated with Pt nanoparticles represent a highly effective material for sensitive and low-temperature methanol detection.
- Pt decoration plays a critical role in enhancing methanol adsorption and surface reactions, leading to superior sensor performance.
- The proposed Pt/ZnO sensing mechanism provides insights into the improved gas-sensing behavior.
