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Name (Title):
Tong Hua (NIMS PD Researcher)
Jinhua Ye (NIMS Managing Director, MANA Principal Investigator)
Affiliation:
Photo-Catalytic Materials Center
(MANA), NIMS
Address: 1-2-1, Sengen, Tsukuba, Ibaraki 305-0047, Japan
Email: TONG.Hua@nims.go.jp; Jinhua.YE@nims.go.jp
Home Page: http://www.nims.go.jp/photocatalyst/group_1/Tong/tong.htm
http://www.nims.go.jp/photocatalyst/group_1/JYE/yejinhua.htm
Presentation Title:
Semiconductor Nanoparticle Assemblies: Adjustable Band Gap and Photocatalytic Applications
Abstract:
The materials with size in nanoscale could have adjustable bandgap, high efficiency in
absorbing photons and larger surface ratio, which are very valuable for improving their
photocatalytic performance. As a typical direct gap semiconductor, cadmium sulfide has suitable
band gap and relatively negative conduct band potential to be used as catalyst for producing
hydrogen under irradiation of visible light. 1, 2 In this work, we found that not only the CdS
nanoparticles have high photocatalytic activity, but also the CdS nanoparticles assembled tubes
(CNATs) have even higher photocatalytic activity due to red-shift of absorption edge.
90
(a)
Absorbance (a.u.)
CNATs before
templates removal
CNATs after
templates removal
200 300 400 500 600 700 800
Wavelength (nm)
CdS nanoparticles
Fig. 1 (a) UV-visible diffuse reflectance spectra of CdS nanoparticles and CNATs, time course of
hydrogen evolution of 0.1 g CdS nanoparticles (b) and CNATs (c), respectively, under light irradiation
from a 300 W Xe-lamp equipped with cutoff filter L42, L52 and a water filter.
References:
(1) N. Bao, L. Shen, T. Takata, K. Domen, J. Phys. Chem. C, 2007, 111, 17527-34.
(2) N. Bao, L. Shen, T. Takata, K. Domen, Chem. Mater., 2008, 20, 110–117.
Amount of H 2 evolved (mmol)
1.5
1.0
0.5
0.0
420 nm filter
520 nm filter
2.0 Nanoparticles
(b) (c)
0 1 2 3 4 5
Time (h)
Amount of H 2 evolved (mmol)
6
4
2
0
Poster Session PG-2
Nanotubes
0 1 2 3 4 5
Time (h)