An efficient and economic sensing material for flexible chemical sensors is increasingly in great demand as a result of its potential application in the healthcare and environmental detection systems. Endowing the nanomaterials with high active facets serves as a promising method for the design of nanomaterials with advanced functionalities. New physicochemical properties of chemical sensor can be obtained by using high active facets nanoparticles combined in one-dimensional (1D) nanofiber/wires. However, it remains a great challenge to conduct the development of 1D heterostructure sensing materials with high selectivity, in particular the ones that can perform under room temperature. Here, a high performance flexible sensing device based on Co3O4 nanoparticles with specific (112) facet in alpha-Fe2O3 nanofiber is reported. The heterointerfaces and grain boundary allow the fast electrons transportation in sensing reactions and the (112) facets in Co3O4 nanoparticles provide a large number of highly active sites where the selective absorption of ammonia gas molecules occurs. Consequently, the flexible gas sensor exhibits ultrahigh sensitivity (417%) and mechanical stability to ammonia gas molecules, which are proved by using density functional theory calculations.
[1]Jilin Univ, State Key Lab Integrated Optoelect, Coll Elect Sci & Engn, Changchun 130012, Jilin, Peoples R China.
[2]Jilin Univ, Hosp 1, Ctr Cardiovasc Dis, Changchun 130021, Peoples R China.
[3]Hunan Agr Univ, Coll Sci, Changcha 410128, Peoples R China.
[4]Jilin Univ, Lab Theoret & Computat Chem, Inst Theoret Chem, Changchun 130012, Jilin, Peoples R China.
[5]Shenzhen Technol Univ, Coll Hlth & Environm Engn, Shenzhen 518118, Peoples R China.
(8.0+极速模式)