• Hua Chen

      Articles written in Bulletin of Materials Science

    • Facile fabrication of highly flexible graphene paper for photocatalytic reduction of 4-nitrophenol

      Hua Chen Guohua Jiang Lei Li Yongkun Liu Qin Huang Tengteng Jiang Xiangxiang Du

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      Freestanding paper-like materials prepared from chemically derived graphene have considerable potential as a carbon-based catalyst in high-performance flexible catalytic reaction. Herein, a highly flexible graphene paper (GP) assembled from graphene oxides (GOs) with the aid of polyacrylamide (PAA) and electroless deposition of gold nanoparticles (AuNPs) was prepared. In contrast to previous reports on GOs based on a flow-directed assembly of graphene sheets, this GOs/PAA/Au composite paper exhibited a highly wrinkled and disordered morphology. The resultant GOs/PAA/Au composite paper was applied as a catalytic material for the reduction of 4-nitrophenol and showed the favour separation, recovery and cyclic utilization properties.

    • Effect of deposition times of Al$_2$O$_3$ buffer layer on the structural and optical properties of AZO film on the polyethylene terephthalate substrates


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      The aluminium-doped zinc oxide with Al$_2$O$_3$ buffer layer (AZO/Al$_2$O$_3$) films were deposited on the polyethyleneterephthalate substrates by radiofrequency magnetron sputtering. Compared with the AZO films without Al2O3 buffer layer, the crystallite size and (002) peak of the AZO/Al$_2$O$_3$ films changed with the deposition times; the full-width at halfmaximum (FWHM) of (002) peak decreases from 0 to 25 min. The effects of Al2O3 buffer layer on the surface morphology of AZO/Al$_2$O$_3$ and optical properties of films were investigated by SEM and UV–Vis–NIR spectrophotometer, respectively. The results reveal that the average transmittance of the AZO films in the visible wavelength region is $\sim$90%, stronger deep level emissions centred on 550 nm is attributed to intrinsic defects in the AZO films on the organic polymer PET substrates.

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