Wenliang Wang

Fabrication of Ultrathin Bi2S3 Nanosheets for High‐Performance, Flexible, Visible–NIR Photodetectors

Ultrathin Bi2 S3 nanosheets with thicknesses down to 2.2 nm are fabricated. The resultant ultrathin Bi2 S3 -based photoconductor shows high sensitivity to visible-near infrared light from 405 to 780 nm with a high external photoresponsivity up to 4.4 A W(-1) , high detectivity of ≈10(11) Jones, relatively fast response time of ≈10 μs, and high flexibility and durability.

Synthesis of FeP2/C nanohybrids and their performance for hydrogen evolution reaction

Phosphorous-rich FeP2/C nanohybrids are synthesized via the pyrolysis of ferrocene (Fe(C5H5)2) and red phosphorus in an evacuated and sealed quartz tube at 500 °C. The nanohybrids contain orthorhombic FeP2 with conical carbon tubes. Based on the calculated electroactive surface area, the performance of the FeP2/C nanohybrids as a novel non-noble metal electrocatalyst for hydrogen evolution reaction (HER) in 0.50 M H2SO4 is investigated. These nanohybrids show good catalytic activity and stability in the acidic medium and might serve as a promising new class of non-noble metal catalysts for practical HER.

Alternative Synthesis of CuFeSe2 Nanocrystals with Magnetic and Photoelectric Properties

Monodisperse CuFeSe2 nanocrystals of high quality have been successfully synthesized for the first time using a hot-solution injection method from the reaction of metallic acetylacetonates with diphenyl diselenide (Ph2Se2) in oleylamine with addition of oleic acid at 255 °C for 90 min. The characterizations of X-ray diffraction, electron microscopy, and compositional analysis reveal that the resulting CuFeSe2 nanocrystals are of tetragonal phase with a stoichiometric composition. The CuFeSe2 nanocrystals exhibit well-defined quasi-cubic shape with an average size of ∼18 nm, and their shape can be tuned from quasi-cubes to quasi-spheres by adjusting the reaction parameters. Magnetic measurement reveals that the as-synthesized CuFeSe2 nanocrystals are ferromagnetic and paramagnetic at 4 and 300 K, respectively. Additionally, the current-voltage (I-V) behavior of the CuFeSe2 nanocrystals suggests that they are promising candidates for application in optoelectronics and solar energy conversion.

Cu2−xSe nanooctahedra: controllable synthesis and optoelectronic properties

Single crystalline copper selenide (Cu2−xSe) nanocrystals (NCs) with well-defined octahedral morphology are successfully synthesized by a colloidal hot-solution injection method from the reaction of anhydrous CuCl with Ph2Se2 under argon flow, in which 1-octadecene (ODE) and oleylamine (OAm) are used as solvent and surfactant, respectively. The Cu2−xSe octahedral nanostructures are characterized by XRD, SEM, TEM, HRTEM, SAED, EDS, FT-IR and XPS and it is found that they are in the cubic phase with high quality. The growth process of the nanostructures is investigated and it is noted that reaction temperature, reaction time and capping surfactant OAm play significant roles in controlling the morphologies of the final products. Meanwhile, the current–voltage (I–V) behavior of the as-prepared octahedral Cu2−xSe nanostructures is explored for the first time and it is found that the Cu2−xSe octahedral nanostructures are promising candidates for application in photodetection and related areas.

Controlled Synthesis of Ultrathin Sb2Se3 Nanowires and Application for Flexible Photodetectors.

A new solvothermal approach is introduced to synthesize ultrathin Sb2Se3 nanowires with diameters ranging from 10 to 20 nm and with length up to 30 μm. The Sb2Se3 nanowire‐based photodetectors are firstly fabricated on polyethylene terephthalate and printing paper substrates, which exhibit excellent response to visible light with fast response time (0.18 and 0.22 s), high flexibility, and durability.

Self-assembly growth of alloyed NiPt nanocrystals with holothuria-like shape for oxygen evolution reaction with enhanced catalytic activity

Self-assembly growth of alloyed NiPt nanocrystals with holothuria-like wire shape has been achieved via a facile and moderate hydrothermal process at 120 °C for 1 h from the reaction of nickel nitrate and chloroplatinic acid in alkaline solution in the presence of ethanediamine and hydrazine hydrate. The holothuria-like alloyed NiPt wires are Ni-rich in composition (Ni23.6Pt) and uniform in diameter with many tiny tips outstretched from the wires surface. The holothuria-like wires are assembled from granular subunits with the assistance of capping molecular of ethanediamine and the wires display an improved oxygen evolution reaction catalytic activity.