Facile Microwave-Assisted Synthesis of Klockmannite CuSe Nanosheets and Their Exceptional Electrical Properties

Abstract

Klockmannite copper selenide nanosheets (CuSe NSs) are synthesized by a facile microwave-assisted method and fully characterized. The nanosheets have smooth surface and hexagonal shape. The lateral size is 200–500 nm × 400–800 nm and the thickness is 55 ± 20 nm. The current-voltage characteristics of CuSe NS films show unique Ohmic and high-conducting behaviors, comparable to the thermally-deposited gold electrode. The high electrical conductivity of CuSe NSs implies their promising applications in printed electronics and nanodevices. Moreover, the local electrical variation is observed, for the first time, within an individual CuSe NS at low bias voltages (0.1 ~ 3 V) by conductive atomic force microscopy (C-AFM). This is ascribed to the quantum size effect of NS and the presence of Schottky barrier. In addition, the influence of the molar ratio of Cu2+/SeO2, reaction temperature, and reaction time on the growth of CuSe NSs is explored. The template effect of oleylamine and the intrinsic crystal nature of CuSe NS are proposed to account for the growth of hexagonal CuSe NSs.

High PEC conversion efficiencies from CuSe film electrodes modified with metalloporphyrin/polyethylene matrices

“…CuSe is believed to have hexagonal [39] and/or orthorhombic phases under certain conditions [40]. Based on comparison with earlier reports [41] the patterns observed here indicate that the both non-annealed and pre-annealed films involved CuSe as a pre-dominant phase, mixed with traces of Cu 2 Se.…”

High-Performance Flexible All-Solid-State Asymmetric Supercapacitors Based on Vertically Aligned CuSe@Co(OH)2 Nanosheet Arrays

“…First, the interconnected CuSe nanosheet arrays was deposited on flexible Au/PET substrate. Due to its special configuration and high electric conductance (The hole mobility can reach 1.87 cm 2 V -1 s -1 , reference 48 The insert in Fig. 2a shows the scanning electron microscopy (SEM) images of naked CuSe nanosheet arrays, it is clearly that the CuSe nanosheets were uniformly aligned vertically on Au/PET substrate at a large scale and formed large open framework between its intersections (Fig.…”

Copper sulfide nanosheets with shape-tunable plasmonic properties in the NIR region

“…Its application in the field of photovoltaics was hindered through the relatively high degradation rate of the Cu x S/CdS interface (CdS served as a window layer for the p-n junction) and the Cu x S absorber [5]. However, during the last decade the attractiveness of the family of copper chalcogenides as cheap low-toxic materials gained attention after several protocols were published for nanostuctured copper chalcogenide synthesis by wet chemical methods [6][7][8][9][10][11][12][13] as promising fabrication method for solution-processable devices like flexible conductive films [11], sensors, solar cells [10,14,15], electrodes for the Li-ion batteries [16] or even moieties for cancer photothermal therapy (CuSe [17]).…”