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1. chinaXiv:201705.00188 [pdf]

Magnetocaloric effect in high Gd content Gd-Fe-Al based amorphous/nanocrystalline systems with enhanced Curie temperature and refrigeration capacity

Zhang, LL [Zhang, Linlin][ 1,2 ]; Bao, MD [Bao, Mingdong][ 2 ]; Zheng, Q [Zheng, Qiang][ 2 ]; Tian, LH [Tian, Linhai][ 1 ]; Du, J [Du, Juan][ 3 ]
Subjects: Materials Science >> Nanoscience and Nanotechnology

The Gd-Fe-Al amorphous/nanocrystalline composites were successfully designed and obtained with both high Curie temperature (Tc) and large magnetic entropy change (∆SM). The Tc can be tuned from 172 to 280 K and refrigeration capacity (RC) has a value between 690 and 867 J/kg under a eld change of 0–5 T by changing the Gd contents and the formation of Gd nanocrystallites. And, ∆SM in Gd-Fe-Al amorphous/nanocrystalline composites reached a value of 7.2 J kg−1 K−1 under a eld change of 0–5 T. The high RC in Gd-Fe-Al system were ascribed to the widening full width at half maximum (δFWHM) up to 240 K of the magnetic entropy change (∆SMmax) peak because of the combination contribution of amorphous matrix and the precipitated Gd-riched nanocrystalline. Our research would shed light on how to design attractive candidates for magnetic refrigeration materials with high perfor- manceatnearroomtemperature

submitted time 2017-05-09 Hits792Downloads490 Comment 0

2. chinaXiv:201705.00663 [pdf]

Characterization of Copper Complex Nanoparticles synthesized by Plant Polyphenols

Zhiqiang Wang
Subjects: Materials Science >> Nanoscience and Nanotechnology

In this paper a kind of copper oxide material of copper–polyphenols complex nanoparticles (Cu–P NPs) were synthesized by Cinnamomum pedunculatum leaves extract, which have different morphology and appearance compared with usual copper oxides Cu2O and CuO. For better understanding about this material, the Cu–P NPs were characterized using scanning electron microscopy (SEM), X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). It was found that synthesized Cu–P NPs were amorphous with spherical particles ranged from 80 to 500 nm. XAS data analysis indicated that the synthesized Cu–P NPs has different molecular structure with Cu2O and CuO. It is assumed that the copper ions chelated with polyphenol molecule. The nanoparticles showed a clear anti Escherichia coli activity in this study, and may also be used in fields of semiconductor, ceramic, catalyst, and sensor. This synthesis approach provided a novel route to manufacture copper oxide nanomaterial.

submitted time 2017-05-07 Hits571Downloads348 Comment 0

3. chinaXiv:201703.00990 [pdf]

Enhanced Rate Capability of Polymer-Derived SiCN Anode Material for Electrochemical Storage of Lithium with 3-D Carbon Nanotube Network Dispersed in Nanoscale

Zhang, JW; Xu, CH; Liu, ZP; Wang, W; Xin, X; Shen, L; Zhou, XB; Zhou, J; Huang, Q (Huang, Q
Subjects: Materials Science >> Nanoscience and Nanotechnology

Electrochemical performances of multi-walled carbon nanotubes (CNT)-SiCN composite have been investigated. The sample was synthesized by a simple ultrasonication assisted method combined with high-temperature pyrolysis and characterized by Fourier transfo

submitted time 2017-03-30 Hits577Downloads365 Comment 0

4. chinaXiv:201703.00988 [pdf]

Low-voltage protonic/electronic hybrid indium zinc oxide synaptic transistors on paper substrates

Wu, GD; Wan, CJ; Zhou, JM; Zhu, LQ; Wan, Q
Subjects: Materials Science >> Nanoscience and Nanotechnology

Low-voltage (1.5 V) indium zinc oxide (IZO)-based electric-double-layer (EDL) thin-film transistors (TFTs) gated by nanogranular proton conducting SiO2 electrolyte films are fabricated on paper substrates. Both enhancement-mode and depletion-mode operatio

submitted time 2017-03-30 Hits620Downloads450 Comment 0

5. chinaXiv:201703.00956 [pdf]

Carboxyl groups trigger the activity of carbon nanotube catalysts for the oxygen reduction reaction and agar conversion

Zhang, YX; Chen, CL; Peng, LX; Ma, ZS; Zhang, YJ; Xia, HH; Yang, AL; Wang, L; Su, DS (Su, D
Subjects: Materials Science >> Nanoscience and Nanotechnology

Ozone treatment is a common way to functionalize commercial multi-walled carbon nanotubes (CNTs) with various oxygen functionalities like carboxyl, phenol and lactone groups, in order to enhance their textural properties and chemical activity. In order to

submitted time 2017-03-30 Hits632Downloads333 Comment 0

6. chinaXiv:201703.00955 [pdf]

Enhanced Rate Capability of Polymer-Derived SiCN Anode Material for Electrochemical Storage of Lithium with 3-D Carbon Nanotube Network Dispersed in Nanoscale

Zhang, JW; Xu, CH; Liu, ZP; Wang, W; Xin, X; Shen, L; Zhou, XB; Zhou, J; Huang, Q (Huang, Q
Subjects: Materials Science >> Nanoscience and Nanotechnology

Electrochemical performances of multi-walled carbon nanotubes (CNT)-SiCN composite have been investigated. The sample was synthesized by a simple ultrasonication assisted method combined with high-temperature pyrolysis and characterized by Fourier transfo

submitted time 2017-03-30 Hits475Downloads333 Comment 0

7. chinaXiv:201703.00953 [pdf]

Low-voltage protonic/electronic hybrid indium zinc oxide synaptic transistors on paper substrates

Wu, GD; Wan, CJ; Zhou, JM; Zhu, LQ; Wan, Q
Subjects: Materials Science >> Nanoscience and Nanotechnology

Low-voltage (1.5 V) indium zinc oxide (IZO)-based electric-double-layer (EDL) thin-film transistors (TFTs) gated by nanogranular proton conducting SiO2 electrolyte films are fabricated on paper substrates. Both enhancement-mode and depletion-mode operatio

submitted time 2017-03-30 Hits566Downloads391 Comment 0

8. chinaXiv:201701.00065 [pdf]

Novel electromechanical actuation based on spongy graphene paper

Ying Hu; Tian Lan; Guan Wu; Zicai Zhu; Xiaomin Tao; Wei Chen
Subjects: Materials Science >> Nanoscience and Nanotechnology

Spongy graphene paper with inside foldable corrugated structure is fabricated by electrothermal reduction of the oxygen-containing groups inside RGO paper. Reversible macroscopical length contraction of the spongy graphene paper with strain of 2.4% under 10V voltage is exhibited, mostly attributed to the deformation of corrugated structures.

submitted time 2017-01-10 Hits630Downloads384 Comment 0

9. chinaXiv:201701.00064 [pdf]

Spongy graphene based bimorph actuator with ultra-large displacement towards biomimetic application

Ying Hu; Tian Lan; Guan Wu; Zicai Zhu; Wei Chen
Subjects: Materials Science >> Nanoscience and Nanotechnology

Bimorph actuators, consisting of two layers with asymmetric expansion and generating bending displacement, have been widely researched. Their actuation performances greatly rely on the differences of coefficient of thermal expansion (CTE) between the two material layers. Here, by introducing a spongy graphene (sG) paper with large negative CTE as well as highly electrical-to-thermal property, an electromechanical sG/PDMS bimorph actuator is designed and fabricated, showing ultra-large bending displacement output under the low voltage stimulation (curvature of about 1.2cm-1 under 10V voltage for 3s), high displacement-to-length ratio (~0.79), and vibration motion under AC voltage (up to 10Hz), which is much larger and faster than that of the other electromechanical bimorph actuators. Based on the sG/PDMS bimorph serving as the “finger”, a mechanical gripper is constructed to realize the fast manipulation of the objects under 0.1 Hz square wave voltage stimulation (0~8V). The designed bimorph actuator coupled with ultra-large bending displacement, low driven voltage, and ease fabrication, may open up substantial possibilities for the utilization of the electromechanical actuator in practical biomimetic device applications.

submitted time 2017-01-10 Hits700Downloads425 Comment 0

10. chinaXiv:201701.00062 [pdf]

AlN成核层厚度对Si上外延GaN的影响

邓旭光; 韩军; 邢艳辉; 汪加兴; 范亚明; 陈翔; 李影智; 朱建军
Subjects: Materials Science >> Nanoscience and Nanotechnology

采用低温 AlN 成核层在 Si(111)衬底上用金属有机化学气相沉积(MOCVD)设备摘要:采用低温 AlN 成核层在 Si(111)衬底上用金属有机化学气相沉积(MOCVD)设备生长了 GaN 薄膜。采用高分辨 X 射线衍射、椭圆偏振光谱仪和原子力显微镜研究了 AlN成核层的厚度对 GaN 外延层的影响。对 AlN 的测试表明,AlN 的表面粗糙度随着厚度增加而变大。对 GaN 的测试表明,所有 GaN 样品在垂直方向处于压应变状态,并且随 AlN 厚度增加而略有减弱。GaN 的(0002) ω扫描的峰值半宽(FWHM)随着 AlN 成核层厚度增加而略有升高,GaN(10-12) ω扫描的峰值半宽随着厚度增加而有所下降。(10-12) ω扫描的峰值半宽与 GaN 的刃型穿透位错密度相关。说明 AlN 成核层的厚度较大时,会降低刃型穿透位错密度,并减弱 c 轴方向的压应变状态。

submitted time 2017-01-10 Hits845Downloads620 Comment 0

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