Steering selectivity in the detection of exhaled biomarkers over oxide nanofibers dispersed with noble metals. Issue 7 (30th January 2023)

• Record Type: Journal Article
• Authors: Park, Seyeon; Lim, Yunsung; Oh, DongHwan; Ahn, Jaewan; Park, Chungseong; Kim, Minhyun; Jung, WooChul; Kim, Jihan; Kim, Il-Doo
• Is Part Of: Journal of materials chemistry. Volume 11:Issue 7(2023)
• Page Start: 3535
• Page End: 3545
• Publication Date: 2023-01-30
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta07226b
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : We systematically study the explicit roles of noble metal catalysts in steering the gas selectivity of metal oxides toward specific target analytes by using highly dispersed catalysts on In2 O3 nanofibers as a consistent synthetic platform. Abstract : The trace detection of biomarker molecules in exhaled breaths enables a facile disease diagnosis in early stages. However, the selective detection of each pathognomonic gas was difficult to achieve due to a poor understanding of the selectivity mechanism, which impeded the development of a rational design for practical diagnostics. Herein, we report a systematic study of the explicit roles of noble metal catalysts in modulating the gas selectivity of metal oxides and provide an in-depth mechanistic understanding of the reaction pathways specific to each element. Using a consistent synthetic platform to prepare highly dispersed catalysts on In2 O3 nanofibers, we identified that Ru and Pd catalysts showed exceptional selectivity to CH3 SH and H2 S, respectively, while Pt selectively interacted with CH3 COCH3 molecules. Furthermore, we revealed that the element-specific gas adsorption and the ensuing charge transfer form the basis for regulating selective surface reactions of target gases. Altogether, we propose a set of design principles for sensing layers based on the prominent, element-dependent roles of catalysts toward the development of a rational synthesis of sensing materials with optimal sensing performance. These principles can be summarized as follows: controlled chemisorption of oxygen species, selective gas adsorption, and subsequent activation of adsorbed gases.