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Updated: Feb 3, 2026

Optical Trapping of Nanoparticles
Published on: January 15, 2013
Optical Sensing Properties of ZnO Nanoparticles Prepared by Spray Pyrolysis
Geon Joon Lee1, Eun Ha Choi1, Sang-Hun Nam2
1Department of Electrical and Biological Physics, Kwangwoon University, Seoul 01897, Korea.
Abstract:
We studied the optical sensing properties of ZnO nanoparticles prepared by spray pyrolysis. To investigate their optical sensing performance, we incubated peptides on ZnO nanoparticles. The photoluminescence (PL) peak intensity of peptides on the ZnO nanoparticles was higher than that of peptides on the ZnO film or on the glass plate. This observed PL enhancement is attributed to the optical confinement of ZnO nanoparticles. The low-temperature spectra displayed a strong exciton emission peak with multiple sidebands, attributed to the bound exciton and its longitudinal optical phonon sidebands. The strong exciton emission is thought to be the combined effect of optical confinement due to the nanoparticle geometry, reduction of defect emission by thermal annealing, and reduction of non-radiative relaxation at low temperatures.
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