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为提高SiO2微球的表面电荷密度,分别利用氯化钠和金属钠引入Na+,通过正硅酸乙酯的水解,合成SiO2微球,并采用垂直沉积法制备出光子晶体.通过Zeta电位粒度仪、带EDS能谱仪的场发射扫描电子显微镜(SEM)和紫外-可见-近红外光谱仪对其电学性能、显微形貌和光学性能进行测试分析.Zeta电位测试结果显示经引入Na+改性后SiO2微球的Zeta电位有明显提高,其中经电解质氯化钠和金属钠改性后分别平均提高11.39和13.52mV;EDS能谱分析表明微球中含有钠元素;SEM照片表明经氯化钠和金属钠改性后样品平均粒径均有所增加,分别为380和354nm,并且标准偏差均小于5%,所得光子晶体为面心立方密排结构;吸收光谱表明经氯化钠和金属钠改性后所得光子晶体分别在856和798nm处具有光子晶体带隙,吸收峰具有明显红移现象,并且更窄更明显.
In order to increase the surface charge density of SiO2 microspheres, sodium chloride and sodium metal were respectively used to introduce Na +, and SiO2 microspheres were synthesized by the hydrolysis of tetraethyl orthosilicate, and the photonic crystals were prepared by vertical deposition method. , Field emission scanning electron microscopy (SEM) and UV-Vis-NIR spectrometer with EDS spectrometer were used to test their electrical properties, micro-morphology and optical properties.Zeta potential test showed that after the introduction of Na + The Zeta potentials of SiO2 microspheres increased obviously, which were improved by 11.39 and 13.52mV respectively after being modified by electrolyte sodium chloride and sodium metal. EDS spectrum analysis showed that the microspheres contained sodium element. The SEM photos showed that sodium chloride and The average particle size of the modified sodium metal samples increased by 380 and 354 nm, respectively, and the standard deviation was less than 5%. The obtained photonic crystal was a face-centered cubic closed-packed structure. The absorption spectra showed that the sodium chloride and sodium The resulting photonic crystals have photonic crystal bandgaps at 856 and 798 nm, respectively. The absorption peak shows a marked red shift and is narrower and more pronounced.