Investigations on new carbon-based nanohybrids combining carbon nanotubes, HfO2 and ZnO nanoparticles

4th International Conference on Competitive Materials and Technology Processes

Rauwel, P.^1 ; Galeckas, A.^2 ; Salumaa, M.^1 ; Aasna, A.^1 ; Ducroquet, F.^3 ; Rauwel, E.^1

Tartu College, Tallinn University of Technology, Tartu

51008, Estonia^1

Department of Physics, University of Oslo, Oslo

0316, Norway^2

IMEP-LAHC, CNRS, Université de Grenoble-Alpes, Minatec Campus, Grenoble

38016, France^3

关键词: Band-gap semiconductors;    Broad spectral;    Deep-level defects;    Defect-related emission;    Photoluminescence properties;    Synthesis conditions;    Visible photoluminescence;    Visible region;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/175/1/012064/pdf
DOI  :  10.1088/1757-899X/175/1/012064

来源: IOP

【 摘 要 】

In this work, we present two types of hybrid materials. The first hybrid material is a combination of carbon nanotubes (CNT) with HfO2nanoparticles. The latter constituent on its own exhibits unusual visible photoluminescence, which is in stark contrast to non-luminescent HfO2in the bulk form. The small size of HfO2nanoparticles, 2.6 nm in average, suggests surface-defect related origin of the observed photoluminescence. The other hybrid material is CNT-ZnO with the embedded ZnO nanoparticles ranging from 50nm to 100nm in size. ZnO represents a direct bandgap semiconductor renowned as highly-luminescent in a broad spectral range. The visible region is attributed to luminescence involving deep-level defects, and hence depends on the synthesis conditions. In this study we compare the morphology of the two hybrid materials with transmission electron microscopy. We further compare the photoluminescence properties and the influence of the CNT coupling on enhancing or suppressing defect related emissions. Finally, we present a novel hybrid material CNT-HfO2capable of producing a photocurrent under zero bias.