journal article·2022-11-30

Assembly of Core/Shell Nanospheres of Amorphous Hemin/Acetone-Derived Carbonized Polymer with Graphene Nanosheets for Room-Temperature NO Sensing

Jianqiang Wang, Yixun Gao, Fengjia Chen, Lulu Zhang, Hao Li, Nicolaas Frans de Rooij, Ahmad Umar, Yi-Kuen Lee, Paddy J. French, Bai Yang, Yao Wang, Guofu Zhou

ACS Applied Materials & Interfaces· Volume 14· Issue 47
Publisher page

Abstract

Implementing parts per billion-level nitric oxide (NO) sensing at room temperature (RT) is still in extreme demand for monitoring inflammatory respiratory diseases. Herein, we have prepared a kind of core–shell structural Hemin-based nanospheres (Abbr.: Hemin-nanospheres, defined as HNSs) with the core of amorphous Hemin and the shell of acetone-derived carbonized polymer, whose core–shell structure was verified by XPS with argon-ion etching. Then, the HNS-assembled reduced graphene oxide composite (defined as HNS-rGO) was prepared for RT NO sensing. The acetone-derived carbonized polymer shell not only assists the formation of amorphous Hemin core by disrupting their crystallization to release more Fe–N4 active sites, but provides protection to the core. Owing to the unique core–shell structure, the obtained HNS-rGO based sensor exhibited superior RT gas sensing properties toward NO, including a relatively higher response (Ra/Rg = 5.8, 20 ppm), a lower practical limit of detection (100 ppb), relatively reliable repeatability (over 6 cycles), excellent selectivity, and much higher long-term stability (less than a 5% decrease over 120 days). The sensing mechanism has also been proposed based on charge transfer theory. The superior gas sensing properties of HNS-rGO are ascribed to the more Fe–N4 active sites available under the amorphous state of the Hemin core and to the physical protection by the shell of acetone-derived carbonized polymer. This work presents a facile strategy of constructing a high-performance carbon-based core–shell nanostructure for gas sensing.
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Research context

OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Advanced Sensor and Energy Harvesting Materials · Covalent Organic Framework Applications

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, Guangzhou510006, P. R. China

National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou510006, P. R. China

Division of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Sun Yat-sen University, Guangzhou510006, P. R. China

Institute of Pulmonary Diseases, Sun Yat-sen University, Guangzhou510006, P. R. China

Promising Centre for Sensors and Electronic Devices, Department of Chemistry, Faculty of Science and Arts, Najran University, Najran11001, Kingdom of Saudi Arabia

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

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

BE Laboratory, EWI, Delft University of Technology, Delft2628CD, The Netherland

State Key Lab of Supramolecular Structure and Materials College of Chemistry, Jilin University, Changchun130012, P. R. China

Funding

Guangdong Science and Technology Department · Guangzhou Science and Technology Program key projects · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · South China Normal University · Education Bureau of Guangdong Province · Guangdong Provincial Key Laboratory of Optical Information Materials and Technology · Guangdong Science and Technology Project-International Cooperation · MOE International Laboratory for Optical Information Technologies

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