Flexible indium oxide gas sensors with enhanced sensitivity and room temperature operation via natural oxidation techniques

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL

Sensors and Actuators B: Chemical Pub Date : 2025-02-09 DOI:10.1016/j.snb.2025.137414

Hanjoo Lee , Sanghyeon Lee , Jaehyeok Kim , Chaebeen Kwon , Sehoon Kim , Hyunho Yang , Yunsu Jang , Taeyoon Lee , Hyungjun Kim , Sungkyu Kim , Hyun S. Kum

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Abstract

Indium oxide is a widely used transparent conductive oxide known for its excellent electrical conductivity and transparency. These properties make indium oxide suitable for various applications, such as lighting displays and chemical sensors, particularly for detecting toxic gases like NO₂ due to its high sensitivity to gas molecules. However, the inherent brittleness of indium oxide limits its use in flexible devices. In this study, we present a novel method for producing ultrasensitive, flexible NO₂ gas sensors through the natural oxidation of indium, which can also be easily textured to enhance sensitivity. We utilized the dewetting characteristics of indium to create micropatterns on the surface, significantly improving the sensor's sensitivity. Comprehensive gas sensing analysis demonstrated the sensors' ultra-sensitivity and rapid response to NO₂ molecules, with a resistance change of up to ∼5200 %. This work offers a simple, cost-effective approach for fabricating flexible gas sensors that operate at room temperature.

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.