Calcination-Induced Transformation of ZnS:Mn2+ Nanorods to Microparticles for Enhanced Mechanoluminescence

• DOI: 10.1021/acs.chemmater.3c01136
• Publication Date: 2023-08-16T17:10:14Z
• Authors: Zhongxiang Wang; Youyi Tai; Jin Nam; Yadong Yin
• Keywords: Wurtzite crystal structure; Nanorod

Mechanoluminescent (ML) materials with reduced dimensions have the potential to advance development of optical microdevices. However, their progress has been hindered by limited understanding ML properties at length scale nano- micrometers. This study aims optimize performance Mn2+-doped wurtzite ZnS examining evolution size, morphology, phase, and surface property as-prepared nanorods during calcination elevated temperatures. It reveals a complex dependence phase on surface-capping ligands, temperature, doping level. Along dimensional increase from micrometers, consistent sphalerite conversion is observed for calcining samples ratios below 0.92 at. %, while those higher exhibit wurtzite–sphalerite–wurtzite transition upon low high temperatures ratio increasing 30% then decreasing 0. Further, found be primarily determined composition highest intensity in microparticles doped 1.0 % Mn2+ calcined 1000 °C. In contrast, photoluminescence less sensitive components but significantly affected absorption carbon species generated pyrolysis ligands. Heavily (3.0 Mn2+) display no noticeable wurtzite-to-sphalerite positive particle size when latter varies 100 nm 2 μm °C starting appear ∼200 nm. The tailored are expected contribute miniaturization advanced devices such as mechano-optical sensors actuators.