A two-step synthesis of nanosheet-covered fibers based on α-Fe2O3/NiO composites towards enhanced acetone sensing

被引：58

作者：

ul Haq, Mahmood ^{[1
]}

Wen, Zhen ^{[2
,3
]}

Zhang, Ziyue ^{[1
]}

Khan, Shahid ^{[1
]}

Lou, Zirui ^{[1
]}

Ye, Zhizhen ^{[1
]}

Zhu, Liping ^{[1
]}

机构：

[1] Zhejiang Univ, Cyrus Tang Ctr Sensor Mat & Applicat, Sch Mat Sci & Engn, State Key Lab Silicon Mat, Hangzhou 310027, Peoples R China

[2] Soochow Univ, Jiangsu Key Lab Carbon Based Funct Mat & Devices, Inst Funct Nano & Soft Mat FUNSOM, Suzhou 215123, Peoples R China

[3] Soochow Univ, Joint Int Res Lab Carbon Based Funct Mat & Device, Suzhou 215123, Peoples R China

来源：

SCIENTIFIC REPORTS | 2018年 / 8卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

FLOWER-LIKE NIO; ELECTROCHEMICAL PROPERTY; BREATH ANALYSIS; MESOPOROUS NIO; GAS; PERFORMANCE; FABRICATION; NANORODS; TOLUENE; SNO2;

D O I：

10.1038/s41598-018-20103-y

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

A novel hierarchical heterostructures based on alpha-Fe2O3/NiO nanosheet-covered fibers were synthesized using a simple two-step process named the electrospinning and hydrothermal techniques. A high density of alpha-Fe2O3 nanosheets were uniformly and epitaxially deposited on a NiO nanofibers. The crystallinity, morphological structure and surface composition of nanostructured based on alpha-Fe2O3/NiO composites were investigated by XRD, SEM, TEM, EDX, XPS and BET analysis. The extremely branched alpha-Fe2O3/NiO nanosheet-covered fibers delivered an extremely porous atmosphere with huge specific surface area essential for superior gas sensors. Different nanostructured based on alpha-Fe2O3/NiO composites were also explored by adjusting the volume ratio of the precursors. The as-prepared samples based on alpha-Fe2O3/NiO nanocomposite sensors display apparently enhanced sensing characteristics, including higher sensing response, quick response with recovery speed and better selectivity towards acetone gas at lower operating temperature as compared to bare NiO nanofibers. The sensing response of S-2 based alpha-Fe2O3/NiO nanosheet- covered fibers were 18.24 to 100 ppm acetone gas at 169 degrees C, which was about 6.9 times higher than that of bare NiO nanofibers. The upgraded gas sensing performance of composites based on alpha-Fe2O3/NiO nanosheet-covered fibers might be ascribed to the exclusive morphologies with large surface area, p-n heterojunctions and the synergetic performance of alpha-Fe2O3 and NiO.

引用

页数：12

共 67 条

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