2015-01-09 09:18
浏览:136次
分享:资料摘要:
表面光电压谱
型号: WAD-SPV530
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面议
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DynaFlex 是汽车白车身在线检测系统:主要针对汽车白车身的孔,插槽,螺钉,螺母,边缘,轮廓,表面点,表面平整度等在线检测,系统可以在40秒内完成对整车的全检。检测每个点只需要3秒钟。另外:我们系统也可以检测汽车零部件,例如:车门、车架、引擎盖等。
The Kelvin Probe method is a relative one. To determine the absolute work function of the sample the vibrating tip has to be calibrated against another “reference” surface. However the value of the tip work function is obviously only as good as the value taken for the reference surface. As a reference sample an aluminum metal plate covered with a thin gold layer has been used (fig. 2). Based on our experiments we assume the gold reference work function as 5.10 eV. The objective of this sample is to measure the contact potential difference (CPD) on the gold surface, and taking the gold reference as 5.10 eV to calculate the tip work function
The scanned sample have been mounted on a aluminum sample holder (fig. 3). Before each SPV measurement the smples have been stored in dark for 12 hours. The contact potential difference (CPD) measured after the 12 hours has been taken as the zero level. The results presented in section 2 show an absolute surface potential change due to light illumination. All measurements have been made in ambient at a temperature of 20±2°C and relative hum idity of 41 ± 2%. In section 3 we presented the light source characteristics
A well‐aligned nanorods array of ZnO was chemically grown on conductive ITO substrate at low temperature. The photogenerated charges at surface and interface were examined by surface photovoltage techniques based on both Kelvin probe and lock‐in amplifier with dc bias. The photovoltage response bands related to band‐to‐band transition and bound excitons were discriminated. We demonstrated the spectrum‐dependent transfer characteristic of photogenerated charges at the surface of ZnO nanorods array and the interface between ZnO and ITO.