Fabrication and Characteristics Investigation of a Novel Nanosensor for Sulfuretted Hydrogen Operating at Room Temperature†

doi:10.7503/cjcu20131161

Chem. J. Chinese Universities ›› 2014, Vol. 35 ›› Issue (6): 1175.doi: 10.7503/cjcu20131161

• Analytical Chemistry • Previous Articles Next Articles

Fabrication and Characteristics Investigation of a Novel Nanosensor for Sulfuretted Hydrogen Operating at Room Temperature^†

HUANG Xiaowei, ZOU Xiaobo^*(), ZHAO Jiewen, SHI Jiyong, LI Zhihua

College of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, China

Received:2013-11-27 Online:2014-06-10 Published:2014-04-29
Contact: ZOU Xiaobo E-mail:zou_xiaobo@ujs.edu.cn
Supported by:
† Support by the National High-tech R & D Program of China(No.2011AA108007), the Jiangsu Provincal Science Fund for Distinguished Young Scholars, China(No.BK20130010), the New Century Excellent Talents in University, China(No.NCET-11-0986), the Specially-Appoin-ted Professors by Universities in Jiangsu Province, the Foundation of Chinese Top 100 Doctoral Dissertation(No.200968), the National Natural Science Foundation of China(No.61301239), the Natural Science Foundation of Jiangsu Province, China(No.BK20130505), the China Postdoctoral Science Foundation(No.2013M540422), Science Foundation for Postdoctoral in Jiangsu Province, China(No.2013M540422), the Scienpngic Innovation Research of College Graduate in Jiangsu Province, China(No.CXZZ13_0697), the Science and Technology Support Program of Zhenjiang, China(No.NY2011026) and the Research Foundation for Advanced Talents in Jiangsu University, China(No.13JDG039)

Abstract

Abstract:

A sulfuretted hydrogen sensor operating at room temperature based on pigment-sensitized TiO₂ films was fabricated. TiO₂ was prepared by sol-gel method and deposited on glass slides containing gold electrodes. The film was then immersed in a 2.5×10^-4 mol/L ethanol solution of cyanidin to absorb the pigment. For characterization of texture, UV-Vis diffuse reflectance spectra, field emission scanning electron microscopy, sulfuretted hydrogen adsorption-desorption measurements and temperature, humidity measurements were adop-ted. The results demonstrate that the sol-gel layers show a high porosity, a slightly more compact material close to the substrate. The cyanidin-sensitized TiO₂ nanosheets exhibit a clear red shift(50 nm) compared with cyanidin. The hybrid organic-inorganic formed film can detect sulfuretted hydrogen reversibly at room temperature. The sensitivity of the films increased almost linearly with increasing the concentrations of sulfuretted hydrogen(R²=0.939). The response time to increasing concentrations of the sulfuretted hydrogen is about 50~70 s, and the corresponding values for decreasing concentrations 160~180 s. At low humidity, sulfuretted hydrogen could be ionized by the cyanidin on the TiO₂ film and thereby decrease in the proton concentration at the surface. The resistance response to sulfuretted hydrogen of the sensors was nearly independent on temperature from 10 ℃ to 50 ℃. This preliminary work proposes simpler and cheaper processes to fabricate gas sensor for room temperature applications.

Key words: Sulfuretted hydrogen, Titanium dioxide, Cyanidin, Sol-gel, Gas sensor

CLC Number:

O657.11

TrendMD:

HUANG Xiaowei, ZOU Xiaobo, ZHAO Jiewen, SHI Jiyong, LI Zhihua. Fabrication and Characteristics Investigation of a Novel Nanosensor for Sulfuretted Hydrogen Operating at Room Temperature^†[J]. Chem. J. Chinese Universities, 2014, 35(6): 1175.

Figures/Tables 8

Fig.1 Schematic diagram of the sensor measurement

Fig.2 Absorption spectra of TiO2 treated with cyaniding(a) and an aqueous solution of cyaniding(b)

Fig.3 Molecular structure of cyanidin anion(A) and mechanism of surface complexation of cyanidin and TiO2(B)

Fig.4 Surface(A) and cross(B) SEM micrographs of a sol-gel TiO2 layer

Fig.5 Response of the flexible assembled pigment-sensitized TiO2 film sensors to various concentrations of H2S vapors……Concentration of H2S/(mL·m-3): 1. 5; 2. 10; 3. 20; 4. 30; 5. 40; 6. 50.

Fig.6 Resistance of 5 sensors on relative H2S concentrations(A) and the sensitivity of pigment-sensitized TiO2 film sensors(B)

Fig.7 Reaction of sulfuretted hydrogen(H2S) and cyanidin sensitized TiO2 film for the lower humidity condition

Fig.8 Dependence of the resistance response to 40 mL/m3 H2S gas(S40, a) and the clean air resistance(R0, b)…… (A) Relative humidity in air at the ambient temperature[(25±1) ℃]; (B) relative temperature in the ambient humidity air(40%).

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Fabrication and Characteristics Investigation of a Novel Nanosensor for Sulfuretted Hydrogen Operating at Room Temperature^†

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