Additions and Corrections pubs.acs.org/crystal
Correction to Enhanced Photochemical Response of TiO2/CdSe Heterostructured Nanowires Jung-Chul Lee, Tae Geun Kim, Heon-Jin Choi, and Yun-Mo Sung* Cryst. Growth Des. 2007, 7, 2588−2593. DOI: 10.1021/cg070588m The authors regretfully announce that the abstract of the published paper does not reflect the main focus of our research. The core part of this research is to investigate the effects of various substrates (sapphire, quartz, and Ti) on the crystal growth behavior of TiO2 nanowires. This paper covers overall experimental results on the growth of TiO2 nanowires produced by our research group. The TiO2 nanowires grown on Ti substrates showed the highest quality due to the increased Ti vapor pressure and TiO2 seed layer formation. They were used to obtain TiO2/CdSe core/shell structured nanowires. Therefore, we would like to correct the abstract of our paper as follows: The crystal growth behavior of TiO2 nanowires via a vapor− liquid−solid (VLS) mechanism was exploited in detail for various substrates including sapphire, quartz, and titanium. Sapphire substrates produced very short (∼1 μm) TiO2 nanorods with ∼30-50 nm diameter, and quartz brought TiO2 particles with ∼300−400 nm diameter. On the other hand titanium substrates generated high-density and highquality TiO2 nanowires with ∼30-70 nm diameter and ∼5−10 μm length within 5 min at 700 °C. The mechanism for the enhanced crystal growth of TiO2 nanowires on titanium substrates was proposed based upon the increased titanium vapor pressure in the reaction chamber due to Ti substrates and TiO2 seed layer formation before the growth of nanowires that can induce homoepitaxial growth of TiO2 nanowires. Highdensity single-crystalline TiO2 nanowires grown from titanium substrates were successfully conjugated with CdSe nanocrystals (∼5 nm diameter) to form TiO2/CdSe heterostructured nanowires by overcoating the nanowires with CdSe-containing solution and subsequent annealing at 600 °C. TiO2/CdSe nanowires showed uniformly distributed CdSe nanocrystals, and high crystallinity of rutile and wurtzite from TiO2 and CdSe, respectively. Because of the heterostructure of the TiO2/ CdSe, they demonstrate almost full visible-range light absorption and enhanced photocatalytic activity due to charge separation via electron and hole transfer between CdSe and TiO2 by type II energy band structure.
Published: July 9, 2012 © 2012 American Chemical Society
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dx.doi.org/10.1021/cg3008552 | Cryst. Growth Des. 2012, 12, 4293−4293
