journal article·2024-06-14

Cobalt–Nitrogen Bonding for Triggering the Low-Power Dual Detection of NO2 and NH3 by Mixed-Valence Co2+ and Co3+

Bala Ismail Adamu, Mukhtar Lawan Adam, Shafia Mukhtar Ibrahim, Adamu Ismail Adamu, Md Ahsan Habib, Xiao Yu, Shuqin Zheng, Mokhotjwa Simon Dhlamini, Peipei Chen, Hanfu Wang, Lingxiang Jiang, Weiguo Chu

ACS Applied Nano Materials· Volume 7· Issue 11
Publisher page

Abstract

The real-time detection of harmful gases like NO 2 and NH 3 is crucial for smart agriculture and the noninvasive diagnosis of kidney, liver, lung, and heart diseases. However, sensing these gases and understanding the primary sensing mechanisms can be challenging since the nitrogen site of NO 2 or NH 3 is the primary site that binds the sensing crystallite. Herein, we designed and fabricated low-cost sensors for dual NO 2 and NH 3 sensing using a nanodevice-on-chips sensor (NDCS) with mixed-valence Co 3 O 4 (Co 2+ and Co 3+ ). Co 3 O 4 –NDCS detects NO 2 and NH 3 at low power, room temperature, and 70% relative humidity. It also exhibits stable, recoverable, and reproducible sensing performance for NO 2 and NH 3, comparable to several high-performance sensors. The dual sensing performances are closely related to two distinct Co sites (Co 2+ and Co 3+ ) in the Co 3 O 4 crystal. Co 2+ could host the nitrogen atom of either NO 2 or NH 3 to form Co–N bonding, which is preferable to NO 2 detection. Meanwhile, the N atom could replace one of the six oxygen atoms coordinating with Co 3+ to form Co–N bonding, favorable to NH 3 detection. Looking forward, the strategy proposed here makes it possible to fabricate high-performance gas sensors with the desired nanostructures and known sensing mechanisms.
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Research context

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Analytical Chemistry and Sensors · Advanced Chemical Sensor Technologies

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

Affiliations

South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou 510640, China

Nanofabrication Laboratory, CAS Key Laboratory of Nanophotonic Materials and Devices, National Center for Nanoscience and Technology, Beijing 100190, China

Guangdong Provincial Key Laboratory of Functional and Intelligent Hybrid Materials and Devices, South China University of Technology, Guangzhou 510640, China

Physics Department, Federal University Dutse, Dutse, Jigawa 720101, Nigeria

Information Materials and Intelligent Sensing Laboratory of Anhui Province, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Institutes of Physical Science and Information Technology, Anhui University, Hefei 230601, China

Physics Department, Bayero University, Kano 700231, Nigeria

Department of Chemistry, Nigerian Army University, Biu, Borno 1500, Nigeria

Department of Physics, College of Science, Engineering and Technology, University of South Africa, Johannesburg 1710, South Africa

Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China

Funding

National Key Research and Development Program of China · Natural Science Foundation of Beijing Municipality · Basic and Applied Basic Research Foundation of Guangdong Province · Guangdong Provincial Pearl River Talents Program · National Natural Science Foundation of China · Beijing Nova Program

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