| Title: | In Situ Grown Gold Nanoisland-Based Chemiresistive Electronic Nose for Sniffing Distinct Odor Fingerprints |
| Author(s): | Gupta P; Gholami Derami H; Mehta D; Yilmaz H; Chakrabartty S; Raman B; Singamaneni S; |
| Address: | "Department of Mechanical Engineering and Materials Science, and Institute of Materials Science and Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States. Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States. Department of Electrical and Systems Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States" |
| Journal Title: | ACS Appl Mater Interfaces |
| ISSN/ISBN: | 1944-8252 (Electronic) 1944-8244 (Linking) |
| Abstract: | "Chemiresistors based on metal-insulator-metal structures are attractive transducers for rapid tracing of a wide repertoire of (bio)chemical species in the vapor phase. However, current fabrication techniques suffer greatly from sensor-to-sensor variability, limiting their reproducible and reliable application in real-world settings. We demonstrate a novel, facile, and ubiquitously applicable strategy for fabricating highly reliable and reproducible organothiol-functionalized gold nanoisland-based chemiresistors. The novel fabrication technique involves iterative in situ seeding, growth, and surface functionalization of gold nanoislands on an interdigitated electrode, which in turn generates a multi-layered densely packed continuous gold nanoisland film. The chemiresistors fabricated using the proposed strategy exhibited high sensor-to-sensor reproducibility owing to the controlled iterative seeding and growth-based fabrication technique, long-term stability, and specificity for detection and identification of a wide variety of volatile organic compounds. Upon exposure to a specific odor, the chemiresistor ensemble comprised nine different chemical functionalities and produced a unique and discernable odor fingerprint that is reproducible for at least up to 90 days. Integrating these odor fingerprints with a simple linear classifier was found to be sufficient for discriminating between all six odors used in this study. We believe that the fabrication strategy presented here, which is agnostic to chemical functionality, enables fabrication of highly reliable and reproducible sensing elements, and thereby an adaptable electronic nose for a wide variety of real-world gas sensing applications" |
| Keywords: | Biocompatible Materials/*chemistry *Electronic Nose Gold/*chemistry Materials Testing Metal Nanoparticles/*chemistry Odorants/*analysis Volatile Organic Compounds/*analysis chemiresistor electronic nose gold nanoisland odor fingerprinting volatile organic; |
| Notes: | "MedlineGupta, Prashant Gholami Derami, Hamed Mehta, Darshit Yilmaz, Huzeyfe Chakrabartty, Shantanu Raman, Baranidharan Singamaneni, Srikanth eng 2022/01/08 ACS Appl Mater Interfaces. 2022 Jan 19; 14(2):3207-3217. doi: 10.1021/acsami.1c22173. Epub 2022 Jan 7" |
