Open AccessEffects of surface modification on nonlinear optical performance of gold nanoparticles
Author(s) -
Zheng Li-Si,
Feng Miao,
Hongbing Zhan
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.054212
Subject(s) - materials science , surface modification , colloidal gold , nanoparticle , laser , transmission electron microscopy , bromide , absorption (acoustics) , ultraviolet , irradiation , absorption spectroscopy , optics , optoelectronics , chemical engineering , nanotechnology , inorganic chemistry , composite material , chemistry , physics , engineering , nuclear physics
Two kinds of gold nanoparticles with different surface-capping groups (Au-DT and Au-DT-CTAB), 1-dodecanthiol and cetyltrimethylammonium bromide (CTAB) are prepared by a two-phase method. Structures and linear optical properties of the materials are characterized using transmission electron microscopy and ultraviolet--visible absorption spectroscopy. The effects of surface modification on nonlinear optical (NLO) performance and optical limiting behavior of gold nanoparticles are investigated using the openZ-scan technique at a laser wavelength of 532 nm. The results show that Au-DT-CTAB shows an enhanced NLO effect in comparison with Au-DT. The secondary modification with CTAB can not only improve local field enhancement effect but also make the contribution of thermoelectrons to NLO performance of gold nanoparticles on laser irradiation.