Preparation of PAMAM- and PPI-metal (silver, platinum, and palladium) nanocomposites and their catalytic activities for reduction of 4-nitrophenol

被引:598
作者
Esumi, K [1 ]
Isono, R
Yoshimura, T
机构
[1] Tokyo Univ Sci, Dept Appl Chem, Shinjuku Ku, Tokyo 1628601, Japan
[2] Tokyo Univ Sci, Inst Colloid & Interface Sci, Shinjuku Ku, Tokyo 1628601, Japan
关键词
D O I
10.1021/la035440t
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Dendrimer-metal (silver, platinum, and palladium) nanocomposites are prepared in aqueous solutions containing poly(amidoamine) (PAMAM) dendrimers with surface amino groups (generations 3, 4, and 5) or poly(propyleneimine) (PPI) dendrimers with surface amino groups (generations 2, 3, and 4). The particle sizes of the metal nanoparticles obtained are almost independent of the generation as well as the concentration of the dendrimer for both the PAMAM and the PPI dendrimers; the average sizes of silver, platinum, and palladium nanoparticles are 5.6-7.5, 1.2-1.6, and 1.6-2.0 nm, respectively. It is suggested that the dendrimer-metal nanocomposites are formed by adsorbing the dendrimers on the metal nanoparticles. Studies of the reduction reaction of 4-nitrophenol by these nanocomposites show that the rate constants are very similar between PAMAM and PPI dendrimer-silver nanocomposites, whereas the rate constants for the PPI dendrimer-platinum and -palladium nanocomposites are greater than those for the corresponding PAMAM dendrimer nanocomposites. In addition, it is found that the rate constants for the reduction of 4-nitrophenol involving all the dendrimer-metal nanocomposites decrease with an increase in the dendrimer concentrations, and the catalytic activity of dendrimer-palladium nanocomposites is highest.
引用
收藏
页码:237 / 243
页数:7
相关论文
共 17 条
[1]   Microscopic protonation equilibria of poly(amidoamine) dendrimers from macroscopic titrations [J].
Cakara, D ;
Kleimann, J ;
Borkovec, M .
MACROMOLECULES, 2003, 36 (11) :4201-4207
[2]   PHOTOPHYSICAL INVESTIGATION OF STARBURST DENDRIMERS AND THEIR INTERACTIONS WITH ANIONIC AND CATIONIC SURFACTANTS [J].
CAMINATI, G ;
TURRO, NJ ;
TOMALIA, DA .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1990, 112 (23) :8515-8522
[3]  
Crooks RM, 2002, METAL NANOPARTICLES: SYNTHESIS, CHARACTERIZATION, AND APPLICATIONS, P261
[4]  
Esumi K, 2000, LANGMUIR, V16, P2604, DOI 10.1021/1a991291w
[5]   Multilayer formation using oppositely charged gold- and silver-dendrimer nanocomposites [J].
Esumi, K ;
Akiyama, S ;
Yoshimura, T .
LANGMUIR, 2003, 19 (18) :7679-7681
[6]   Comparison of PAMAM-Au and PPI-Au nanocomposites and their catalytic activity for reduction of 4-nitrophenol [J].
Esumi, K ;
Miyamoto, K ;
Yoshimura, T .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2002, 254 (02) :402-405
[7]  
ESUMI K, 2000, SHIKIZAI KYOKAISHI, V73, P434
[8]  
GRATZEL M, 1982, J PHYS CHEM-US, V86, P2964
[9]   Electrostatic multilayer deposition of a gold-dendrimer nanocomposite [J].
He, JA ;
Valluzzi, R ;
Yang, K ;
Dolukhanyan, T ;
Sung, CM ;
Kumar, J ;
Tripathy, SK ;
Samuelson, L ;
Balogh, L ;
Tomalia, DA .
CHEMISTRY OF MATERIALS, 1999, 11 (11) :3268-3274
[10]   Self-assembled gold nanoparticle/dendrimer composite films for vapor sensing applications [J].
Krasteva, N ;
Besnard, I ;
Guse, B ;
Bauer, RE ;
Mullen, K ;
Yasuda, A ;
Vossmeyer, T .
NANO LETTERS, 2002, 2 (05) :551-555