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Facile microwave-assisted synthesis of Klockmannite CuSe nanosheets and their exceptional electrical properties.

Liu YQ, Wang FX, Xiao Y, Peng HD, Zhong HJ, Liu ZH, Pan GB - Sci Rep (2014)

Bottom Line: 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 Cu(2+)/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.

View Article: PubMed Central - PubMed

Affiliation: Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 215123 Suzhou, P. R. China.

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 Cu(2+)/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.

No MeSH data available.


(a) XRD pattern of as-prepared CuSe nanosheets. (b) Crystal structure of klockmannite CuSe. The light green shaded atoms represent Se, while the deep blue shaded atoms represent Cu.
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f1: (a) XRD pattern of as-prepared CuSe nanosheets. (b) Crystal structure of klockmannite CuSe. The light green shaded atoms represent Se, while the deep blue shaded atoms represent Cu.

Mentions: The phase and purity of CuSe NSs are characterized by X-ray diffraction (XRD). All the diffraction peaks in the XRD pattern (Fig. 1a) can be accurately indexed to the hexagonal klockmannite phase of CuSe (JCPDS No. 34-0171, a = b = 3.939 Å, c = 17.25 Å, Pmmc 63). No diffraction peaks of other impurities are found in the XRD pattern, indicating that the product is pure CuSe. Moreover, the intensity of (006) peak is much stronger than that of other peaks, implying that the as-prepared CuSe NSs are oriented along <001> direction. This is in good agreement with the highly anisotropic crystal structure and the weak interaction between the (001) planes in the klockmannite phase (Fig. 1b).


Facile microwave-assisted synthesis of Klockmannite CuSe nanosheets and their exceptional electrical properties.

Liu YQ, Wang FX, Xiao Y, Peng HD, Zhong HJ, Liu ZH, Pan GB - Sci Rep (2014)

(a) XRD pattern of as-prepared CuSe nanosheets. (b) Crystal structure of klockmannite CuSe. The light green shaded atoms represent Se, while the deep blue shaded atoms represent Cu.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4126004&req=5

f1: (a) XRD pattern of as-prepared CuSe nanosheets. (b) Crystal structure of klockmannite CuSe. The light green shaded atoms represent Se, while the deep blue shaded atoms represent Cu.
Mentions: The phase and purity of CuSe NSs are characterized by X-ray diffraction (XRD). All the diffraction peaks in the XRD pattern (Fig. 1a) can be accurately indexed to the hexagonal klockmannite phase of CuSe (JCPDS No. 34-0171, a = b = 3.939 Å, c = 17.25 Å, Pmmc 63). No diffraction peaks of other impurities are found in the XRD pattern, indicating that the product is pure CuSe. Moreover, the intensity of (006) peak is much stronger than that of other peaks, implying that the as-prepared CuSe NSs are oriented along <001> direction. This is in good agreement with the highly anisotropic crystal structure and the weak interaction between the (001) planes in the klockmannite phase (Fig. 1b).

Bottom Line: 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 Cu(2+)/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.

View Article: PubMed Central - PubMed

Affiliation: Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, 215123 Suzhou, P. R. China.

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 Cu(2+)/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.

No MeSH data available.