Enhanced H2S gas-sensing performance of α-Fe2O3 nanofibers by optimizing process conditions and loading with reduced graphene oxide

被引：29

作者：

Nguyen Van Hoang ^{[1
]}

Chu Manh Hung ^{[1
]}

Nguyen Duc Hoa ^{[1
]}

Nguyen Van Duy ^{[1
]}

Nguyen Van Toan ^{[1
]}

Hoang Si Hong ^{[2
]}

Phung Thi Hong Van ^{[3
]}

Nguyen Tang Son ^{[4
]}

Yoon, Soon-Gil ^{[5
]}

Nguyen Van Hieu ^{[6
,7
]}

机构：

[1] Hanoi Univ Sci & Technol, Int Training Inst Mat Sci, Hanoi, Vietnam

[2] Hanoi Univ Sci & Technol, Sch Elect Engn, Hanoi, Vietnam

[3] Hanoi Univ Nat Resources & Environm, Fac Basics Sci, Hanoi, Vietnam

[4] Phenikaa Univ, Fac Biotechnol, Chem & Environm Engn, Hanoi, Vietnam

[5] Chungnam Natl Univ, Dept Mat Sci & Engn, Daejeon 34134, South Korea

[6] Phenikaa Univ, Fac Elect & Elect Engn, Phenikaa Inst Adv Study, Hanoi, Vietnam

[7] A&A Green Phoenix Grp, Phenikaa Res & Technol Inst PRATI, 167 Hoang Ngan, Hanoi, Vietnam

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2020年 / 826卷

关键词：

RGO; alpha-Fe2O3; Nanofibers; Electrospinning; H2S; Gas sensors; FAST-RESPONSE; FACILE SYNTHESIS; SENSOR; HYBRID; FABRICATION; MORPHOLOGY; BEHAVIOR; SIZE;

D O I：

10.1016/j.jallcom.2020.154169

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We systematically investigated the effects of process conditions and reduced graphene oxide (RGO) loading on the H2S gas-sensing performance of the alpha-Fe2O3 nanofibers (NFs) fabricated via on-chip electrospinning. The annealing temperature and precursor solution contents strongly influenced on the morphology and structure of the alpha-Fe2O3 NFs that accordingly affected on the gas-sensing performance. The optimum process conditions with the annealing temperature of 600 degrees C and the precursor solution contents of 11 wt% PVA and 4.0 wt% Fe(NO3)(3)center dot 9H(2)O led to the alpha-Fe2O3 NF sensors having a high response of similar to 6.1 at 1 ppm H2S gas. The RGO loading further improved the gas response, increasing the response to 1 ppm H2S gas up to similar to 9.2. Also, the RGO-loaded alpha-Fe2O3 NF sensors enhanced their selectivity and detection limit as compared with pure alpha-Fe2O3 NF sensors. The enhanced gas-sensing performance was attributed to the presence of nanograins, the increase of surface-to-volume ratio and the formation of potential barriers at nanograin homojunctions and RGO/alpha-Fe2O3 heterojunctions. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：11

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