Donor-pi-acceptor structure between Ag nanoparticles and azobenzene chromophore and its enhanced third-order optical non-linearity.
An amorphous silica hybrid film containing covalently linked azobenzene chromophores and Ag nanoparticles was synthesized by a one-step sol-gel route in the presence of amino trialkoxysilane (APTES). The electron transfer from the N-containing groups in the APTES and azobenzene molecules, which are chemisorbed onto the surface of Ag nanoaprticles, makes the Ag nanoparticles negatively charged. Subsequently, a new D-pi-A electron structure between the Ag nanoparticles and the N-containing groups/azobenzene chromophores is created. The enhanced internal electric field in the nanoparticles and the strengthened and extended pi-conjugation in the new D-pi-A electron structure, lead to the large enhancement of optical non-linearity of the hybrid films.
Li
Jiangtian
J
State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, 1295 Dingxi Road, Shanghai 200050, China.
Guo
Limin
L
Zhang
Lingxia
L
Yu
Chichao
C
Yu
Ling
L
Jiang
Peng
P
Wei
Chenyang
C
Qin
Fei
F
Shi
Jianlin
J
D001391:Azo Compounds / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D015394:Molecular Structure; D010316:Particle Size; D012821:Silanes / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013499:Surface Properties
D001391:Azo Compounds; D012821:Silanes; D012834:Silver; C009850:azobenzene