New Insights towards High-Temperature Ethanol-Sensing Mechanism of ZnO-Based Chemiresistors

被引：16

作者：

Piliai, Lesia ^{[1
]}

Tomecek, David ^{[2
]}

Hruska, Martin ^{[2
]}

Khalakhan, Ivan ^{[1
]}

Novakova, Jaroslava ^{[1
]}

Fitl, Premysl ^{[2
]}

Yatskiv, Roman ^{[3
]}

Grym, Jan ^{[3
]}

Vorokhta, Mykhailo ^{[1
]}

Matolinova, Iva ^{[1
]}

Vrnata, Martin ^{[2
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, Dept Surface & Plasma Sci, V Holesovickach 2, Prague 18000 8, Czech Republic

[2] Univ Chem & Technol Prague, Dept Phys & Measurements, Tech 5, Prague 16628 6, Czech Republic

[3] Czech Acad Sci, Inst Photon & Elect, Chaberska 1014-57, Prague 18251 8, Czech Republic

来源：

SENSORS | 2020年 / 20卷 / 19期

关键词：

near-ambient pressure XPS; ZnO nanorods; ethanol-sensing mechanism; acetaldehyde pathway; carbon contamination; GAS SENSOR; ROOM-TEMPERATURE; SPECTROSCOPY; SENSITIVITY; SNO2; ACETALDEHYDE; NANOWIRES; SURFACE; METAL; XPS;

D O I：

10.3390/s20195602

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

In this work, we investigate ethanol (EtOH)-sensing mechanisms of a ZnO nanorod (NRs)-based chemiresistor using a near-ambient-pressure X-ray photoelectron spectroscopy (NAP-XPS). First, the ZnO NRs-based sensor was constructed, showing good performance on interaction with 100 ppm of EtOH in the ambient air at 327 degrees C. Then, the same ZnO NRs film was investigated by NAP-XPS in the presence of 1 mbar oxygen, simulating the ambient air atmosphere and O-2/EtOH mixture at the same temperature. The partial pressure of EtOH was 0.1 mbar, which corresponded to the partial pressure of 100 ppm of analytes in the ambient air. To better understand the EtOH-sensing mechanism, the NAP-XPS spectra were also studied on exposure to O-2/EtOH/H2O and O-2/MeCHO (MeCHO = acetaldehyde) mixtures. Our results revealed that the reaction of EtOH with chemisorbed oxygen on the surface of ZnO NRs follows the acetaldehyde pathway. It was also demonstrated that, during the sensing process, the surface becomes contaminated by different products of MeCHO decomposition, which decreases dc-sensor performance. However, the ac performance does not seem to be affected by this phenomenon.

引用

页码：1 / 14

页数：14

共 48 条

[31] A NEW DETECTOR FOR GASEOUS COMPONENTS USING SEMICONDUCTIVE THIN FILMS [J].