Details
| Original language | English |
|---|---|
| Article number | 1604685 |
| Journal | Advanced functional materials |
| Volume | 27 |
| Issue number | 8 |
| Publication status | Published - 16 Jan 2017 |
Abstract
A variety of new ternary and quaternary metal–semiconductor inorganic nanostructures with unprecedented structural morphologies is achieved by the decoration of five monolayer-thick CdSe/CdS core/crown nanoplatelets with Au and Pt domains. Significant differences in metal growth behavior are observed by varying the CdSe core and the CdS crown dimensions. Depending on the core size, Au growth can be directed only to the CdS edges, or both at the edges and at the center of the nanoplatelets. In contrast, the nucleation of Pt domains always happens at the CdS edges independently of the core and crown dimensions. Furthermore, quaternary structures are obtained by additional Au growth on Pt-decorated CdSe/CdS nanoplatelets, where the effect of steric hindrance of the existing Pt domains results in the Au nucleation to occur only at the CdSe core. Instead, a change in the order of growth of the two noble metals results in Pt-Au alloys present only at the surrounding edges of the nanoplatelets. Additionally, the metal-decorated nanoplatelets are found to be efficient catalysts for H2 fuel generation under white light irradiation. The highest apparent quantum efficiency measured is 19.3% ± 1.4% with a turnover frequency of ≈105 molecules of H2 per hour per nanoplatelet.
Keywords
- charge carrier separation, core/crown nanoplatelets, metal–semiconductor inorganic nanoplatelets, nanoheteroplatelets, photocatalytic hydrogen generation
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Advanced functional materials, Vol. 27, No. 8, 1604685, 16.01.2017.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Synthesis of Ternary and Quaternary Au and Pt Decorated CdSe/CdS Heteronanoplatelets with Controllable Morphology
AU - Naskar, Suraj
AU - Lübkemann, Franziska
AU - Hamid, Saher
AU - Freytag, Axel
AU - Wolf, Andreas
AU - Koch, Julian
AU - Ivanova, Irina
AU - Pfnür, Herbert
AU - Dorfs, Dirk
AU - Bahnemann, Detlef W.
AU - Bigall, Nadja C.
N1 - Funding information: N.C. Bigall, S. Naskar, A. Freytag, and F. Lübkemann are grateful for the financial support from the German Federal Ministry of Education and Research (BMBF) within the framework of the program NanoMatFutur, support code 03X5525. The authors would also like to thank Frank Steinbach from the Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, for help with the TEM-EDXS analysis. D. Dorfs and A. Wolf are grateful to the Deutsche Forschungsgemeinschaft (DFG) for funding (Grant No. DO 1580/2-1). S. Hamid, I. Ivanova and D. W. Bahnemann acknowledge financial support from the BMBF (Bundesministerium für Bildung und Forschung), research project DuaSol (03SF0482C). The authors acknowledge Hannah. N. Cook for proof reading.
PY - 2017/1/16
Y1 - 2017/1/16
N2 - A variety of new ternary and quaternary metal–semiconductor inorganic nanostructures with unprecedented structural morphologies is achieved by the decoration of five monolayer-thick CdSe/CdS core/crown nanoplatelets with Au and Pt domains. Significant differences in metal growth behavior are observed by varying the CdSe core and the CdS crown dimensions. Depending on the core size, Au growth can be directed only to the CdS edges, or both at the edges and at the center of the nanoplatelets. In contrast, the nucleation of Pt domains always happens at the CdS edges independently of the core and crown dimensions. Furthermore, quaternary structures are obtained by additional Au growth on Pt-decorated CdSe/CdS nanoplatelets, where the effect of steric hindrance of the existing Pt domains results in the Au nucleation to occur only at the CdSe core. Instead, a change in the order of growth of the two noble metals results in Pt-Au alloys present only at the surrounding edges of the nanoplatelets. Additionally, the metal-decorated nanoplatelets are found to be efficient catalysts for H2 fuel generation under white light irradiation. The highest apparent quantum efficiency measured is 19.3% ± 1.4% with a turnover frequency of ≈105 molecules of H2 per hour per nanoplatelet.
AB - A variety of new ternary and quaternary metal–semiconductor inorganic nanostructures with unprecedented structural morphologies is achieved by the decoration of five monolayer-thick CdSe/CdS core/crown nanoplatelets with Au and Pt domains. Significant differences in metal growth behavior are observed by varying the CdSe core and the CdS crown dimensions. Depending on the core size, Au growth can be directed only to the CdS edges, or both at the edges and at the center of the nanoplatelets. In contrast, the nucleation of Pt domains always happens at the CdS edges independently of the core and crown dimensions. Furthermore, quaternary structures are obtained by additional Au growth on Pt-decorated CdSe/CdS nanoplatelets, where the effect of steric hindrance of the existing Pt domains results in the Au nucleation to occur only at the CdSe core. Instead, a change in the order of growth of the two noble metals results in Pt-Au alloys present only at the surrounding edges of the nanoplatelets. Additionally, the metal-decorated nanoplatelets are found to be efficient catalysts for H2 fuel generation under white light irradiation. The highest apparent quantum efficiency measured is 19.3% ± 1.4% with a turnover frequency of ≈105 molecules of H2 per hour per nanoplatelet.
KW - charge carrier separation
KW - core/crown nanoplatelets
KW - metal–semiconductor inorganic nanoplatelets
KW - nanoheteroplatelets
KW - photocatalytic hydrogen generation
UR - http://www.scopus.com/inward/record.url?scp=85009350186&partnerID=8YFLogxK
U2 - 10.1002/adfm.201604685
DO - 10.1002/adfm.201604685
M3 - Article
AN - SCOPUS:85009350186
VL - 27
JO - Advanced functional materials
JF - Advanced functional materials
SN - 1616-301X
IS - 8
M1 - 1604685
ER -