Semiconductor quantum dot-inorganic nanotube hybrids

• Published in: Physical chemistry chemical physics : PCCP 2012-03, Vol.14 (12), p.4271-4275
• Main Authors: KREIZMAN, Ronen, SCHWARTZ, Osip, DEUTSCH, Zvicka, ITZHAKOV, Stella, ZAK, Alla, COHEN, Sidney R, TENNE, Reshef, ORON, Dan
• Format: Article
• Language: English
• Subjects: Cadmium Compounds - chemistry; Carbon; Chemistry; Colloids - chemistry; Energy gaps (solid state); Exact sciences and technology; General and physical chemistry; INT; Nanocomposites; Nanomaterials; Nanostructure; Nanotubes - chemistry; Particle Size; Photonic band gaps; Quantum Dots; Selenium Compounds - chemistry; Semiconductors; Sulfides - chemistry; Sulfur - chemistry; Surface Properties; Tungsten - chemistry; Zinc Compounds - chemistry
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/c2cp24043b

A synthetic route for preparation of inorganic WS(2) nanotube (INT)-colloidal semiconductor quantum dot (QD) hybrid structures is developed, and transient carrier dynamics on these hybrids are studied via transient photoluminescence spectroscopy utilizing several different types of QDs. Measurements reveal efficient resonant energy transfer from the QDs to the INT upon photoexcitation, provided that the QD emission is at a higher energy than the INT direct gap. Charge transfer in the hybrid system, characterized using QDs with band gaps below the INT direct gap, is found to be absent. This is attributed to the presence of an organic barrier layer due to the relatively long-chain organic ligands of the QDs under study. This system, analogous to carbon nanotube-QD hybrids, holds potential for a variety of applications, including photovoltaics, luminescence tagging and optoelectronics.