Response to “Comment on ‘Gold nanowires from silicon nanowire templates’ ” [Appl. Phys. Lett. 85, 692 (2004)]

Effective photocatalysis of functional nanocomposites based on carbon and TiO2 nanoparticles

“…34 In a previous study it was found that TiO 2 exhibited an apparent linear lattice expansion with a diminishment of the grain size to the nanometer regime (<50 nm), as a result of the formation of surface defect dipoles, in contrast with metal nanoparticles that typically exhibited positive surface pressure and hence lattice contraction instead with shrinking physical dimensions. 35 In the present study, the TiO 2 nanoparticles were very small, only about 5 nm in diameter. Because of low coordination of the surface sites, bonding interactions with reactive molecules (e.g., H 2 O) likely occurred, leading to the generation of surface defect dipoles and lattice expansion, as observed above.…”

“…1). 35 It should be mentioned that reports of photoluminescence emission of TiO 2 nanoparticles are generally rather few, as titania is a well-known indirect bandgap semiconductor and in most previous studies the nanoparticles possess low crystallinity and broad size distributions. [48][49][50][51][52] In an earlier study, using a sol-gel method we prepared TiO 2 nanoparticles (5 nm in diameter) that were attached onto a gold Janus nanoparticle surface and observed apparent uorescence characteristics with the excitation and emission peaks at ca.…”

Electron–phonon interaction and size effect study in catalyst based zinc oxide thin films

“…This gives a strong evidence for the replacement of oxygen by fluorine. The green emission is widely believed to originate from single negatively charged interstitial oxygen ion (O À i (À)) which prefers to aggregate at the surface of the ZnO nanostructure and the yellow emission can be ascribed to the intrinsic defects [40].…”

Structure-correlated excitation wavelength-dependent optical properties of ZnO nanostructures for multifunctional applications

“…5 In contrast, the origin of yellow and orange-red emissions is presumed to be less debatable than that of green emissions, but the contradictory claim remains. The origin of yellow emission from ZnO is ascribed to the adsorbed hydroxide ions on the nanostructure surface or due to interstitial oxygen (O i ) defects, 6 the presence of impurity atoms like Li, 7 the presence of [Zn(OH) 2 ] on the surface, 8 etc., or it originates from the dislocation induced luminescence centre. Similar to green and yellow emissions, different studies show the diverse origins of orange-red emission.…”