Photocatalytically Powered Matchlike Nanomotor for Light‐Guided Active SERS Sensing. (7th September 2018) - Wang, Yong
Abstract: Surface enhanced Raman spectroscopy (SERS) is a powerful optical sensing technique that can detect analytes of extremely low concentrations. However, the presence of enough SERS probes in the detection area and a close contact between analytes and SERS probes are critical for efficient acquisition of a SERS signal. Presented here is a light‐powered micro/nanomotor (MNM) that can serve as an active SERS probe. The matchlike AgNW@SiO2 core–shell structure of the nanomotors work as SERS probes based on the shell‐isolated enhanced Raman mechanism. The AgCl tail serves as photocatalytic nanoengine, providing a self‐propulsion force by light‐induced self‐diffusiophoresis. The phototactic behavior was utilized to achieve enrichment of the nanomotor‐based SERS probes for on‐demand biochemical sensing. The results demonstrate the possibility of using photocatalytic nanomotors as active SERS probes for remote, light‐controlled, and smart biochemical sensing on the micro/nanoscale. Abstract : Wie ein Streichholz sieht der lichtgetriebene Nanomotor aus, in dem eine AgNW@SiO2 ‐Kern‐Schale‐Struktur als Sonde für die oberflächenverstärkte Raman‐Spektroskopie (SERS) dient. Der AgCl‐Schwanz sorgt als photokatalytischer Nanoantrieb für die Fortbewegung durch lichtinduzierte Selbstdiffusiophorese. Der Nanomotor ist eine aktive SERS‐Sonde für intelligente biochemische Sensoranwendungen auf der Mikro/Nanoskala.