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.

PY - 2017/2/23

Y1 - 2017/2/23

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 -