Interface Oxygen Vacancy‐Enhanced Co₃O₄/WO₃ Nanorod Heterojunction for Sub‐ppm Level Detection of NO_{x}

Mathankumar Manoharan; Kamaraj Govindharaj; Karuppasamy Muthumalai; Sabarish Kumaravel; Yuvaraj Haldorai; Ramasamy Thangavelu Rajendra Kumar

doi:10.1002/adem.202300727

journal article·2023-10Open access

Interface Oxygen Vacancy‐Enhanced Co₃O₄/WO₃ Nanorod Heterojunction for Sub‐ppm Level Detection of NO_x

Mathankumar Manoharan, Kamaraj Govindharaj, Karuppasamy Muthumalai, Sabarish Kumaravel, Yuvaraj Haldorai, Ramasamy Thangavelu Rajendra Kumar

Advanced Engineering Materials· Volume 25· Issue 20

Publisher page Open full text

Source abstract

Abstract

Herein, a cobalt oxide/tungsten oxide (Co₃O₄/WO₃) p–n heterojunction for NO_x detection is developed and optimized. Field‐emission scanning electron microscopy shows that the WO₃ nanorods are embellished with Co₃O₄ nanostructure. X‐ray photoelectron spectroscopy reveals the presence of oxygen vacancy on the Co₃O₄ coupled with WO₃ heterojunction. Compared to bare WO₃ and pure Co₃O₄, the Co₃O₄/WO₃ heterojunction sensor shows significant sensitivity to NO_x at 200 °C. The sensor exhibits higher linearity from 0.4 to 10 ppm of NO_x, with a sensing response of 4.4–93%. The NO_x sensitivity of the Co₃O₄/WO₃ heterojunction sensor is ninefold higher than that of the pure WO₃ sensor. Even in a high humidity (84%) environment, the Co₃O₄/WO₃ heterojunction sensor demonstrates high NO_x sensitivity. The sensor maintains remarkable stability measured for up to 4 weeks. The possible NO_x sensing mechanism of the Co₃O₄/WO₃ heterojunction is additionally discussed.

Source: crossref · Quality: baseline

Research context

Nanomaterials

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Analytical Chemistry and Sensors · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Advanced Materials and Devices Laboratory Department of Nanoscience and Technology Bharathiar University Coimbatore Tamilnadu 641046 India

School of Chemical Engineering Yeungnam University Gyeongsan Gyeonbuk 38541 Republic of Korea

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