Macroscale TiO2 Microspherical Arrays with Multiple Synergistic Effect for Highly Sensitive Surface‐Enhanced Raman Scattering

• DOI: 10.1002/adfm.202400523
• Publication Date: 2024-02-29T10:46:45Z
• Authors: Junfang Li; Qinhui Xie; Junbo Li; Lei Sun; Yunfei Xie; Yukihiro Ozaki; Wei Ji
• Keywords: 01 natural sciences; 0104 chemical sciences

Abstract Semiconductor materials represent an ideal choice for designing surface‐enhanced Raman scattering (SERS)‐based sensors due to their superior thermal and chemical stability compared conventional metal materials. However, current SERS‐active semiconductor substrates have limitations such as low detection sensitivity often complicated preparation steps, which restrict real‐life applications. In this work, the first time feasibility of large‐area fabricating based on screen‐printing micron‐sized TiO 2 ink synthesized through a simple flame thermal‐assisted method is demonstrated. The resultant microspherical arrays (MSAs) exhibit extraordinary SERS with enhancement factor 3.28 × 10 7 , represents one highest are easiest strategy among reported substrates. Both experiments simulations rationalize observed propose that multiple synergistic resonances, including Mie resonance, charge‐transfer molecular resonance significantly boost performance Dye‐modified MSAs further exploited sensing platform development ratiometric sensor, enabling highly sensitive, selective, cost, stable Hg 2+ ions. This study opens up new possibilities preparing large‐scale array, ultimately advancing fields semiconductor‐based technology.