排序方式: 共有34条查询结果,搜索用时 31 毫秒
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A photonic crystal fibre (PCF) surface enhanced Raman scattering (SERS) sensor is developed based on silver nanoparticle colloid. Analyte solution and silver nanoparticles are injected into the air holes of PCF by a simple modified syringe to overcome mass-transport constraints, allowing more silver nanoparticles involved in SERS activity. This sensor offers significant benefit over the conventional SERS sensor with high flexibility, easy manufacture. We demonstrate the detection of 4-mercaptobenzoic acid (4-MBA ) molecules with the injecting way and the common dipping measurement. The injecting way shows obviously better results than the dipping one. Theoretical analysis indicates that this PCF SERS substrate offers enhancement of about 7 orders of magnitude in SERS active area. 相似文献
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锂离子电池正极材料LiCoO2的制备新方法 总被引:2,自引:0,他引:2
利用电解金属钴制得Co(OH)2-2xRx(其中R为有机酸和无机酸根离子)中间产物,然后根据钴含量与LiOH·H2O)固相反应制得了LiCoO2.通过X光衍射,扫描电镜以及激光粒度测试表明,所得的锂离子正极材料LiCoO2结构纯正,粒度分布集中,比表面积较大:对其进行充放电实验表明,放电容量比较高,首次放电容量达到146mAh/g,循环10次后容量仍保持在142mAh/g.该法可大大降低制备LiCoO2的生产成本,具有十分广阔的应用前景. 相似文献
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We study the sensing properties of an intensity-modulated fiber-optic surface plasmon resonance (SPR) sensor using radially polarized beam (RPB). Because of the rotational symmetry of fiber and RPB, surface plasmon can be excited more efficiently at the sensor surface, which results in an obvious improvement of the sensitivity. Our experiments demonstrate that the sensitivity in the case of RPB illumination is three times higher than that of linearlv polarized beam illumination. 相似文献
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本研究了Ar气和H2/Ar混合气体退火对Tl2Ba2CaCu2Ox(2212)超导体超导电性的影响。实验表明,在Ar气中400℃退火1至12小时后Tl2Ba2CaCu2Ox的Tc(R=0)随退火时间的增长明显降低。X-光衍射分析证实,在Ar气或H2/Ar混合气体中退火前后,Tl2Ba2CaCu2Ox超导体的结构没有发生变化。 相似文献
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微波法制备掺碳LiFePO4正极材料 总被引:7,自引:0,他引:7
Cathode material LiFePO4 of lithium-ion battery was synthesized by microwave heating. The “carbon-included” LiFePO4 with improved conductivity was synthesized by the addition of graphite. And the influence of microwave-heating time on structure, morphology and charge/discharge performance of the products was discussed. The results of XRD, SEM, XPS, CV and charge/discharge testing measurements showed that the LiFePO4 product after 9 min in microwave oven had more advantages than other products. 相似文献