| Title: | Innovative Approach to Photo-Chemiresistive Sensing Technology: Surface-Fluorinated SnO(2) for VOC Detection |
| Author(s): | Bahuguna G; Mondal I; Verma M; Kumar M; Bhattacharya S; Gupta R; Kulkarni GU; |
| Address: | "Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur 342037, Rajasthan, India. Centre for Nano and Soft Matter Sciences, Jalahalli, Bangalore 560013, India. Manipal Academy of Higher Education, Manipal 576104, Karnataka, India. Department of Physics, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India. Chemistry of Physics of Materials Unit and Thematic Unit of Excellence in Nanochemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "Transparent electronics continues to revolutionize the way we perceive futuristic devices to be. In this work, we propose a technologically advanced volatile organic compound (VOC) sensor in the form of a thin-film transparent display fabricated using fluorinated SnO(2) films. A solution-processed method for surface fluorination of SnO(2) films using Selectfluor as a fluorinating agent has been developed. The doped fluorine was optimized to be <1%, resulting in a significant increase in conductivity and reduction in persistent photoconductivity accompanied by a faster decay of the photogenerated charge carriers. A combination of these modified properties, together with the intrinsic sensing ability of SnO(2), was exploited in designing a transparent display sensor for ppm-level detection of VOCs at an operating temperature of merely 150 degrees C. Even a transparent metal mesh heater is integrated with the sensor for ease of operation, portability, and less power usage. A sensor reset method is developed while shortening the UV exposure time, enabling complete sensor recovery at low operating temperatures. The sensor is tested toward a variety of polar and nonpolar VOCs (amines, alcohols, carbonyls, alkanes, halo-alkanes, and esters), and it exhibits an easily differentiable response with sensitivity in line with the electron-donating tendency of the functional group present. This work opens up the door for multiplexed sensor arrays with the ability to detect and analyze multiple VOCs with specificity" |
| Keywords: | UV activation fluorinated sensor tin oxide transparent volatile organic compounds; |
| Notes: | "PubMed-not-MEDLINEBahuguna, Gaurav Mondal, Indrajit Verma, Mohit Kumar, Manish Bhattacharya, Saswata Gupta, Ritu Kulkarni, Giridhar U eng 2020/08/21 ACS Appl Mater Interfaces. 2020 Aug 19; 12(33):37320-37329. doi: 10.1021/acsami.0c08847. Epub 2020 Aug 10" |
