PEDOT Films Doped with Titanyl Oxalate as Chemiresistive and Colorimetric Dual-Mode Sensors for the Detection of Hydrogen Peroxide Vapor

被引:2
作者
Xie, Xiaowen [1 ,2 ]
Gao, Nan [3 ]
Hunter, Matthew [4 ]
Zhu, Ling [1 ,2 ]
Yang, Xiaomei [5 ]
Chen, Shuai [1 ,2 ,3 ]
Zang, Ling [4 ,5 ]
机构
[1] Jiangxi Sci & Technol Normal Univ, Jiangxi Key Lab Flexible Elect, Nanchang 330013, Peoples R China
[2] Jiangxi Sci & Technol Normal Univ, Sch Pharm, Nanchang 330013, Peoples R China
[3] Jiangxi Engn Lab Waterborne Coating, Nanchang 330013, Peoples R China
[4] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 USA
[5] Univ Utah, Nano Inst Utah, Salt Lake City, UT 84112 USA
关键词
hydrogen peroxide; chemosensor; chemiresistive; colorimetric; PEDOT; PSS; ammonium titanyl oxalate; humidity effect; H2O2; NANOMATERIALS;
D O I
10.3390/s23063120
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Hydrogen peroxide (H2O2) is commonly used as an oxidizing, bleaching, or antiseptic agent. It is also hazardous at increased concentrations. It is therefore crucial to monitor the presence and concentration of H2O2, particularly in the vapor phase. However, it remains a challenge for many state-of-the-art chemical sensors (e.g., metal oxides) to detect hydrogen peroxide vapor (HPV) because of the interference of moisture in the form of humidity. Moisture, in the form of humidity, is guaranteed to be present in HPV to some extent. To meet this challenge, herein, we report a novel composite material based on poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) doped with ammonium titanyl oxalate (ATO). This material can be fabricated as a thin film on electrode substrates for use in chemiresistive sensing of HPV. The adsorbed H2O2 will react with ATO, causing a colorimetric response in the material body. Combining colorimetric and chemiresistive responses resulted in a more reliable dual-function sensing method that improved the selectivity and sensitivity. Moreover, the composite film of PEDOT:PSS-ATO could be coated with a layer of pure PEDOT via in situ electrochemical synthesis. The pure PEDOT layer was hydrophobic, shielding the sensor material underneath from coming into contact with moisture. This was shown to mitigate the interference of humidity when detecting H2O2. A combination of these material properties makes the double-layer composite film, namely PEDOT:PSS-ATO/PEDOT, an ideal sensor platform for the detection of HPV. For example, upon a 9 min exposure to HPV at a concentration of 1.9 ppm, the electrical resistance of the film increased threefold, surpassing the bounds of the safety threshold. Meanwhile, the colorimetric response observed was 2.55 (defined as the color change ratio), a ratio at which the color change could be easily seen by the naked eye and quantified. We expect that this reported dual-mode sensor will find extensive practical applications in the fields of health and security with real-time, onsite monitoring of HPV.
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页数:15
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