Issue 5, 2023

Voltage driven chemiresistor with ultralow power consumption based on self-heating bridged WO3 nanowires

Abstract

Metal oxide semiconductor (MOS)-based chemiresistors have been widely used for detecting harmful gases in many industrial and indoor/outdoor applications, which possess the advantages of small size, low cost, integratability, and ease of use. However, power consumption has become a critical parameter for practical applications. Several methods have been explored to reduce power consumption including reducing the operation temperature, use of micro-electro-mechanical systems (MEMS), and self-heating working mode. Among them, the self-heating working mode has attracted significant attention. Herein, a facile approach of modulating bridged NW chemiresistor by Joule heating effect is proposed to combine both the superiority of single crystal nanowire (NW) carrier channels and power consumption optimization of the self-heating mode. The WO3-bridged NW chemiresistors and WO3 film NW chemiresistors are both constructed to investigate gas responses and power consumption. Substantially magnified electrical responses (Rg/Ra) of WO3 NW chemiresistor toward NO2 is demonstrated by constructing a bridged structure. Under the optimal external heating condition, the responses of chemiresistors toward 5 ppm NO2 can be boosted from 369.7 (film NW) to 1089.7 (bridged NW). The responses to 5 ppm NO2 under the self-heating mode also can be boosted from 13.6 (film NW) to 24.6 (bridged NW) with a drastically declined power consumption. Self-heating bridged NWs allows for localizing the Joule heat within the nanojunction, and thus substantially lowers the power consumption to 0.13 μW (300 °C). This provides an additional opportunity for reducing power consumption of oxide chemiresistors for air quality monitoring in future.

Graphical abstract: Voltage driven chemiresistor with ultralow power consumption based on self-heating bridged WO3 nanowires

Supplementary files

Article information

Article type
Paper
Submitted
27 Sep 2022
Accepted
19 Dez 2022
First published
23 Dez 2022

Nanoscale, 2023,15, 2162-2170

Voltage driven chemiresistor with ultralow power consumption based on self-heating bridged WO3 nanowires

T. Dai, Z. Deng, M. Li, S. Wang, M. Chen and G. Meng, Nanoscale, 2023, 15, 2162 DOI: 10.1039/D2NR05324A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements