journal article·2025-04-11

NO Detection on Exposed Fe–N4 Sites Deposited on Nanometer-Sized Cu-Hemin MOFs Coated on Reduced Graphene Oxide at Room Temperature

You Wu, Weiran Li, Yanwei Chang, Yixun Gao, Fengnan Wang, Hao Li, Paddy J. French, Yi-Kuen Lee, Sheikh A. Akbar, Ahmad M. Umar Siddiqui, Yao Wang, Guofu Zhou

ACS Applied Nano Materials· Volume 8· Issue 14
Publisher page

Abstract

For the practical diagnosis of inflammatory respiratory diseases, achieving sensitive and rapid NO sensing at the parts per billion level, all at room temperature, is of great significance. Herein, we developed a chemiresistor gas sensor with a sheet-on-sheet structure composed of an amorphous Cu-hemin MOF with reduced graphene oxide (rGO) nanosheets. The SEM images show that the Cu-hemin MOF/rGO composite exhibits a two-dimensional sheet-like structure. Due to its nanosized architecture, the Cu-hemin MOF exhibits a significant number of active sites for efficient NO detection. The Cu-hemin MOF/rGO composite material exhibited excellent NO sensing performance, including high sensitivity ( R a / R g = 1.06, 50 ppb), reliable repeatability, high selectivity, and fast response/recovery (43 s/367 s, 10 ppm). The mechanism study revealed that the formation of the MOF altered the hemin dimer’s structure, resulting in the release of additional Fe(III)–N 4 active sites and improved sensitivity. Moreover, the incorporation of rGO significantly boosted the conductivity of Cu-hemin MOFs. Using this two-dimensional sheet-like material, a mask-type sensor was also prepared and verified to be effective as a flexible and wearable sensing device for parts per billion level exhaled NO detection.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Metal-Organic Frameworks: Synthesis and Applications · Advanced Nanomaterials in Catalysis

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

Affiliations

Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics

South China Normal University

National Center for International Research on Green Optoelectronics

Department of Thoracic Oncology, State Key Laboratory of Respiratory Diseases

The First Affiliated Hospital of Guangzhou Medical University

BE Laboratory, EWI

Delft University of Technology

Department of Mechanical & Aerospace Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong Special Administrative Region, Hong Kong

Department of Electronic & Computer Engineering, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon 999077, Hong Kong Special Administrative Region, Hong Kong

Department of Materials Science and Engineering, The Ohio State University, 140 W 19th Avenue, Columbus, Ohio 43055, The United States

Department of Chemistry, Faculty of Science and Arts and Promising Centre for Sensors and Electronic Devices (PCSED)

Najran University

Funding

National Natural Science Foundation of China · Guangdong Basic and Applied Basic Research Foundation · Department of Science and Technology of Guangxi Province · Startup Foundation from SCNU, Guangdong Provincial Key Laboratory of Optical Information Materials and Technology

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