Abstract
ZnO-CNT hybrid materials were prepared by non-aqueous sol-gel routes at 240ºC. The morphology and defects have been studied by transmission electron microscopy and photoluminescence spectroscopy. The hybrid nanostructures manifest a broad luminescence emission covering the visible spectrum. Variations in photoluminescence with time are observed for the ZnO-CNT hybrid structures exposed to different ambient and temperatures. The studies show that photoluminescence from adsorbed oxygen dominates the emission emanating from other intrinsic defects and also affects the stability of the latter over time.
Highlights
ZnO and carbon-nanotube (CNT) hybrid materials have gained popularity over the past decades [1, 2] which is largely due to the influence that the carbon-based component exerts over the synthesis of ZnO nanoparticles, in determining the ultimate properties
The other characteristic feature is a broad visible emission originating from intrinsic defects that introduce luminescent states within the band gap, commonly referred to as deep-level emission (DLE) band
We extend further our earlier studies of PL in air and in vacuum [7] and focus on the charge carrier behavior over time by monitoring time evolution of the PL features of ZnO-CNT hybrid structures prepared via a non-aqueous sol gel route at 240oC
Summary
ZnO and carbon-nanotube (CNT) hybrid materials have gained popularity over the past decades [1, 2] which is largely due to the influence that the carbon-based component exerts over the synthesis of ZnO nanoparticles, in determining the ultimate properties. We extend further our earlier studies of PL in air and in vacuum [7] and focus on the charge carrier behavior over time by monitoring time evolution of the PL features of ZnO-CNT hybrid structures prepared via a non-aqueous sol gel route at 240oC. Such an approach provides insights into the origin of luminescent states within the bandgap and their stability at different temperatures (10K and 300K) and ambient conditions (vacuum and air), which are among the key factors in determining the potential of these hybrid nanostructures in optoelectronic applications
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