title: Donor-pi-acceptor structure between Ag nanoparticles and azobenzene chromophore and its enhanced third-order optical non-linearity.
abstract: 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.
authors.affiliation: State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Science, 1295 Dingxi Road, Shanghai 200050, China.
authors.forename: Jiangtian
authors.initials: J
authors.lastname: Li
authors.forename: Limin
authors.initials: L
authors.lastname: Guo
authors.forename: Lingxia
authors.initials: L
authors.lastname: Zhang
authors.forename: Chichao
authors.initials: C
authors.lastname: Yu
authors.forename: Ling
authors.initials: L
authors.lastname: Yu
authors.forename: Peng
authors.initials: P
authors.lastname: Jiang
authors.forename: Chenyang
authors.initials: C
authors.lastname: Wei
authors.forename: Fei
authors.initials: F
authors.lastname: Qin
authors.forename: Jianlin
authors.initials: J
authors.lastname: Shi
mesh_terms: 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
chemical_list: D001391:Azo Compounds; D012821:Silanes; D012834:Silver; C009850:azobenzene