Plasmonic Nanostructures Grown from Reacting Droplet‐In‐Microwell Array on Flexible Films for Quantitative Surface‐Enhanced Raman Spectroscopy in Plant Wearable In Situ Detection

• DOI: 10.1002/adma.202405576
• Publication Date: 2024-07-23T04:55:24Z
• Authors: Chiranjeevi Kanike; Qiuyun Lu; Hongyan Wu; Larry D. Unsworth; Arnab Atta; Xuehua Zhang
• Keywords: Surface-Enhanced Raman Spectroscopy; Plasmonic Nanoparticles

Abstract Plant wearable detection has garnered significant interest in advancing agricultural intelligence and promoting sustainable food production amidst the challenges of climate change. Accurately monitoring plant health agrochemical residue levels necessitates qualities such as precision, affordability, simplicity, noninvasiveness. Here, a novel attachable plasmonic film is introduced designed for on‐site residues utilizing surface‐enhanced Raman spectroscopy (SERS). By functionalizing thin polydimethylsiloxane with silver nanoparticles via controlled droplet reactions micro‐well arrays, achieved that not only maintains optical transparency precise analyte localization but also conforms closely to surface, facilitating highly sensitive SERS measurements. The reliability this enables accurate identification quantification individual compounds their mixtures, boasting an ultra‐low limit ranging from 10 −16 −13 m , mini mal relative standard deviation. To showcase its potential, on‐field pesticide on fruit surfaces conducted using handheld spectrometer. This advancement fabricating nanostructures flexible films holds promise expanding applications beyond monitoring, including personalized point‐of‐care diagnosis, devices human–machine interface, environmental pollutants.