排序方式: 共有38条查询结果,搜索用时 458 毫秒
11.
12.
新型有机非线性光学晶体-L-苹果酸脲晶体生长的初步探讨 总被引:2,自引:2,他引:0
本文初步探讨了新型非线性光学晶体-L-苹果酸脲的晶体生长,研究结果表明,L-苹果酸脲晶体在甲醇、乙醇和水三种介质中的溶解度温度系数均较大,同温度下L-苹果酸脲晶体在水中的溶解度最大,无水甲醇次之,无水乙醇中最小.L-苹果酸脲晶体在无水甲醇中的成核自由能比在无水乙醇中的低得多,因此在无水甲醇中易于成核,晶核数多,晶体尺寸小,而在无水乙醇介质中,虽然成核相对比较困难一些,但有利于制备大的单晶,且发现低温有利于大晶体的生长.因此宜选择无水乙醇为晶体生长介质.L-苹果酸脲晶体在介质中以非均匀成核方式在试管壁成核长大,晶体呈棱柱状,生长过程中呈现台阶生长的特征. 相似文献
13.
14.
15.
16.
17.
18.
通过简单的水热合成路线,在没有模板、表面活性剂的作用和未处理的基底上合成出铝掺杂ZnO 纳米盘,并以纳米盘为基底自组装合成了ZnO纳米棒阵列.扫描电镜(SEM)观察到铝掺杂ZnO纳米盘的厚度为 200 nm,纳米盘的尺寸约为2 μm;纳米棒的直径约为150 nm,长约1.5 μm.通过不同生长阶段的形貌变化探讨了ZnO纳米结构的形成机理,表明自组装过程存在两个成核阶段.另外, 研究了铝离子掺杂对样品光致发光性质的影响. 相似文献
19.
20.
Optoelectronic characterisation of an individual ZnO nanowire in contact with a micro-grid template 下载免费PDF全文
Optoelectronic characterisation of an individual ZnO nanowire in contact with a micro-grid template has been studied.The low-cost micro-grid template made by photolithography is used to fabricate the ohmic contact metal electrodes.The current increases linearly with the bias,indicating good ohmic contacts between the nanowire and the electrodes.The resistivity of the ZnO nanowire is calculated to be 3.8 ·cm.We investigate the photoresponses of an individual ZnO nanowire under different light illumination using light emitting diodes(λ = 505 nm,460 nm,375 nm) as excitation sources in atmosphere.When individual ZnO nanowire is exposured to different light irradiation,we find that it is extremely sensitive to UV illumination;the conductance is much larger upon UV illumination than that in the dark at room temperature.This phenomenon may be related to the surface oxygen molecule adsorbtion,which indicates their potential application to the optoelectronic switching device. 相似文献