PNNL-13501 - Pacific Northwest National Laboratory

Intensity (a.u.)
0 100 200 300 400 500 600 700
Temperature (K)
BC-(1x2)
SC-(1x1)
SC-(1x2)
Figure 4. Temperature programmed desorption
measurements of CO desorption from platinum clusters on
rutile (110) 1x1 and 1x2 surfaces. CO desorbes from small
clusters at higher temperatures than from larger clusters or
from bulk platinum. These results show that some aspects of
surface chemistry can be altered by controlling platinum
cluster size.
-6.0
-4.0
-2.0
2.0 4.0 6.0
Bias (V)
Figure 5. Scanning tunneling spectroscopy curves obtained
from clusters of different sizes and a clean surface. Curve I
is for the rutile surface and show expected large band-gap
behavior. Curves II and III are for 0.8 and 1.4 nm platinum
clusters and show nonmetallic behavior. Clusters with a
diameter of 4.5 nm appear metallic.
Publications and Presentations
Gan S, Y Liang, and DR Baer. 2000. “Atomic control of
TiO2(110) surface by Oxygen Plasma Treatment.”
Surface Science 459:L498-L502.
Baer DR, Y Liang, S Gan, and A Grant. 2000.
“Formation and stabilization of nano-sized Pt clusters on
TiO2 surfaces.” In Proceedings of AIChE 2000 Spring
National Meeting, Atlanta, Georgia.
Gan S, Y Liang, DR Baer, and AW Grant. September
2000. “Effects of titania surface structure on the
nucleation and growth of Pt nanoclusters on rutile TiO2
(110).” Physical Review B (submitted).
Gan S, Y Liang, DR Baer, MR Sievers, GS Herman, and
CHF Peden. August 2000. “The effect of Pt nanocluster
size and surface structure upon CO desorption chemistry
on Pt supported TiO2 (110). J. Chem. Phys. Lett.
(submitted).
Gan S, DR Baer, MR Sievers, GS Herman, C Peden, and
Y Liang. September 2000. “Effects of titania surface
structure on Pt nanoclusters on TiO2 (110): nucleation,
growth, and chemisorption.” Pacific Northwest American
Vacuum Society Meeting, Portland, Oregon.
Liang Y, A Grant, D Baer, and S Gan. October 1999.
“Formation and properties of Pt on TiO2 rutile and
anatase surfaces.” AVS meeting, Seattle.
Liang Y, S Gan, TT Tran, SA Chambers, and DE
McCready. December 1999. “Characterization of TiO2
anatase thin films.” Materials Research Society Fall
Meeting, Boston.
Liang Y, S Gan, DR Baer, MR Sievers, GS Herman, and
C Peden. October 2000. “Nano-sized Pt clusters on TiO2
rutile surfaces: growth, self-organization, and
chemisorption.” 2000 National Lab Catalysis
Conference, Argonne, Illinois.
Micro/Nano Technology 349