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以葡萄糖为还原剂,采用化学镀原位合成纳米银-石墨烯复合材料(Ag/GR),通过X射线衍射(XRD)、X射线能量色散谱(EDS)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和傅里叶红外光谱(FTIR)等方法对材料的结构形态进行表征分析.结果表明,石墨烯表面银的负载形态为预期的单质状态,AgNPs平均粒径约为21 nm.同时,利用循环伏安法(CV)、交流阻抗谱(EIS)、线性伏安扫描法(LSV)和差分脉冲伏安法(DPV)对抗坏血酸(AA)在Ag/GR/GCE电化学传感器上的电化学响应进行研究.电化学测试结果表明,Ag/GR复合材料具有最高的响应电化学信号212.9μA和最低的电荷转移电阻90.5Ω,峰值电流约为石墨烯电极(110μA)的2倍和玻碳电极(42.5μA)的5倍,AgNPs与石墨烯具有良好的协同作用,对AA具有明显的电催化活性.AA的阳极峰电流在5~120μmol/L浓度范围内线性增加.然而,AA的阳极峰电流与浓度范围为50~120μmol/L的自然对数高度相关,检测限为0.06μmol/L. 相似文献
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《Composites Part A》2008,39(4):588-596
The novel fabrication technique that patterns the multiple electrodes of the ionic polymer metal composite actuators was developed to mimic the swimming and flapping locomotion of a living thing. The developed method is to combine electroplating with the electroless chemical reduction using the patterned mask. The advantages of this fabrication method are that the initial compositing between the polymer and platinum particles can be assured by the chemical reduction method, and the thickness of each electrode can be controlled easily and rapidly by electroplating. By using the fabricated actuator with a multiple degree of freedom, the oscillatory and undulatory waves of the flexible membrane actuator was generated and a twisting motion was also realized to verify the possibility of mimicking the fish-like locomotion. Present results show that this novel method combining electroplating with electroless plating can be a promising technique to easily pattern multiple electrodes and to implement the biomimetic motion of the polymer actuators with good mechanical bending performance. 相似文献
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采用包覆工艺制备了AgSnO_2电接触材料,通过分散剂种类、球磨时间、活化剂种类等工艺参数的优化,制备了性能合格的AgSnO_2电接触材料。实验结果表明,聚乙二醇对SnO_2颗粒具有较好的分散作用,但不能完全消除SnO_2颗粒团聚;液态球磨能获得组织均匀的AgSnO_2材料,但材料的电阻率过高;活化剂Bi_2O_3和CuO的加入能有效地提高材料的致密度和降低电阻率;在加入0.25%Bi_2O_3+0.25%CuO并液态球磨4h后的试样致密度为98.2%,电阻率为2.25μΩ·cm。 相似文献
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化学镀Ni-Cu-P合金的研究 总被引:2,自引:0,他引:2
通过对化学镀Ni-Cu-P合金工艺配方的研究,确定较佳的工艺配方,探讨各种因素对化学镀层的性能的影响.实验结果发现CuSO4的含量对镀层黑度的影响较大.该工艺具有能耗低、工艺简单、不污染环境、成本低等优点. 相似文献
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The core–shell Al/Fe composite powders were synthesised by electroless plating. The effects of concentration of FeSO4·7H2O, pre-treatment method of aluminium powders, and secondary plating on the preparation of core–shell Al/Fe composite powders were studied. The composite powders were analysed by the X-ray diffraction, a scanning electron microscope, and an energy-dispersive spectrometer. The results indicate that the content of iron in the composite powders could be effectively controlled by adjusting the concentration of FeSO4·7H2O in the plating solution. The pre-treatment of the raw aluminium powders is also a key factor to form a uniform iron layer on the surface of aluminium particles. Furthermore, the density and iron content of the composite powders prepared by secondary plating have been improved. 相似文献
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研究了化学沉积RE-Ni-Mo-P-WC复合镀层的组织结构及性能.结果发现:加入稀土元素能使镀层表面的晶粒急剧细化,分散性大大加强.镀层结构由非晶态转化为晶态结构.镀层的耐蚀性略有下降.硬度随WC浓度增加而增加,钼酸钠浓度为0.05g/L并经过200 ℃热处理后,显微硬度增大.氧化膜的质量随温度的升高逐渐增加,但在600 ℃以下氧化温度对镀层增重不明显. 相似文献
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Super-hydrophobic nano-sized copper films were fabricated on smooth glass substrates by an improved electroless plating technology. The copper film deposited for 1 min showed extremely high hydrophobicity with a water contact angle of 138.0o and super-hydrophobicity with a water contact angle of 152.4o when it was modified with 1-octadecanethiol (CH3-(CH2)17-SH). Such super-hydrophobicity is attributed to the combined roles of the surface hierarchical structure consisting of the micro-sized island-shaped agglomerates that are composed of the nano-sized copper nodules and the low surface energy formed through the chemical modification. 相似文献
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聚氨酯泡沫表面化学镀镍的研究 总被引:1,自引:1,他引:0
采用化学镀方法对聚氨酯泡沫进行处理,在其表面均匀包覆一层镍镀层,达到表面金属化改性的目的.分别用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、红外光谱仪(IR)和热重分析仪(TG)对化学镀镍前后聚氨酯泡沫的形貌、结构及热分解行为进行了表征.结果表明:通过化学镀工艺制备的镍镀层由直径为1~2μm的颗粒组成,且呈一定的取向.化学镀镍后聚氨酯泡沫的X射线衍射强度和红外透过率都有所降低.化学镀镍前后聚氨酯泡沫的TG曲线都由两个失重阶段构成,由于化学镀后聚氨酯泡沫表面的镍镀层被氧化,因此在650~1000℃之间,其TG曲线还呈现一定的上升趋势. 相似文献
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玻璃纤维化学镀Ni-Fe-P合金的研究 总被引:10,自引:2,他引:8
通过化学镀方法在玻璃纤维表面沉积了Ni Fe P合金,所用镀液经钯盐法测试稳定性很好,所得镀合金玻璃纤维热震实验后表面无鼓泡、起皮现象,说明镀层的抗冲击强度高,结合力良好。并利用扫描电镜观察分析了镀层的表面形貌,同时使用 X射线能谱仪对镀层成分含量进行了测定分析,铁的质量百分含量最大可达 21.8%,并得出了镍含量、铁含量对镀层导电性能的影响情况,制备的镀合金玻璃纤维电阻率可为7.32×10-4Ω·cm。最后还对所得 Ni Fe P合金玻璃纤维的电磁参数进行了初步的测定分析,所得镀金属玻璃纤维的磁损耗为0.307;介电损耗为1.44。 相似文献
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Electroless nickel plating process has been studied considering pure copper (99.99%) as a substrate material. Deposition per unit area has been considered as a response variable and individual as well as combined effects of process parameters on deposited mass have been studied. Regression analysis and Student’s t test have been used to identify the significant influencing process parameters. It has been observed that reducing agent (NaBH4), source of metal (NiCl2 · 6H2O) and temperature significantly affect the deposition. The interactions among various process parameters have also been observed to be significant. Mathematical modeling has been carried out by a second-order response surface model with central composite design (CCD) to take into account the effect of curvature in the predicted response. Equations for response surfaces have been determined for various deposition times using MATLAB software package. Most of the response surfaces show that deposition thickness increases with increased values of process parameters within the adopted range but with different rates. The test for reliability for predicting response surface equations shows that these equations give an excellent fitting to the observed values. 相似文献
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Chunju Xu Guilin Liu Huiyu Chen Ruihua Zhou Yaqing Liu 《Journal of Materials Science: Materials in Electronics》2014,25(6):2611-2617
A simple electroless copper plating process was employed to prepare copper-coated glass fibers with excellent conductivity. The glass fibers were pretreated by etching, sensitizing, and activating procedures. Disodium ethylenediamine tetra acetate (EDTA-2Na) and hydrazine hydrate (N2H4·H2O) were employed as complex reagent and reductant, respectively. It was found that the copper deposition was greatly influenced by dosage of EDTA-2Na, concentration of sodium hydroxide (NaOH), temperature, and volume of N2H4·H2O. The optimal temperature for electroless copper plating ranged from 40 to 60 °C. The composites were characterized by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy techniques. The result showed that the minimum volume resistivity of 0.0010 Ω cm was obtained for the sample with perfect copper coatings on the surface of glass fibers. This method is simple, low-cost, and large production, and can be extended to fabricate other metal-coated glass fibers with distinct conductivity. 相似文献