Sol−Gel Assembly of CdSe Nanoparticles to Form Porous Aerogel Networks
- 27 May 2006
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 128 (24), 7964-7971
- https://doi.org/10.1021/ja061561e
Abstract
A detailed study of CdSe aerogels prepared by oxidative aggregation of primary nanoparticles (prepared at room temperature and high temperature conditions, >250 °C), followed by CO2 supercritical drying, is described. The resultant materials are mesoporous, with an interconnected network of colloidal nanoparticles, and exhibit BET surface areas up to 224 m2/g and BJH average pore diameters in the range of 16−32 nm. Powder X-ray diffraction studies indicate that these materials retain the crystal structure of the primary nanoparticles, with a slight increase in primary particle size upon gelation and aerogel formation. Optical band gap measurements and photoluminescence studies show that the as-prepared aerogels retain the quantum-confined optical properties of the nanoparticle building blocks despite being connected into a 3-D network. The specific optical characteristics of the aerogel can be further modified by surface ligand exchange at the wet-gel stage, without destroying the gel network.Keywords
This publication has 26 references indexed in Scilit:
- Deep-Ultraviolet Quantum Interference Metrology with Ultrashort Laser PulsesScience, 2005
- Nonlinear optical characterisation of CdS and PbS quantum dots dispersed in a glass matrixphysica status solidi (c), 2004
- Electrically conductive oxide aerogels: new materials in electrochemistryJournal of Materials Chemistry, 2001
- Photoluminescent Properties of Cadmium Selenide in Contact with Solutions and Films of Metalloporphyrins: Nitric Oxide Sensing and Evidence for the Aversion of an Analyte to a Buried Semiconductor−Film InterfaceJournal of the American Chemical Society, 2000
- The morphology of nanoscale deposits of rutheniumoxide in silica aerogelsNanostructured Materials, 1999
- Electrochemical Properties of High Surface Area Vanadium Oxide AerogelsElectrochemical and Solid-State Letters, 1999
- Aerogels—Airy Materials: Chemistry, Structure, and PropertiesAngewandte Chemie-International Edition, 1998
- Semiconductor Clusters, Nanocrystals, and Quantum DotsScience, 1996
- Aerogels and Xerogels of V 2 O 5 as Intercalation HostsJournal of the Electrochemical Society, 1995
- Die Bildung von Cadmiumcarbonat und Cadmiumsulfit aus CadmiumoxidZeitschrift für anorganische und allgemeine Chemie, 1964