排序方式: 共有64条查询结果,搜索用时 15 毫秒
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利用射频磁控溅射制备了氮掺杂TiO2-xNx薄膜托槽,通过X射线衍射(XRD)、扫描电镜(SEM)等测试手段表征了托槽表面薄膜的结构、形貌,并通过原子力显微镜(AFM)、多功能材料表面试验仪等研究了TiO2-xNx薄膜与基底托槽的附着力、TiO2-xNx薄膜托槽的表面粗糙度以及表面摩擦系数。结果表明制备的托槽表面为均一的锐钛矿相结构TiO2-xNx薄膜,晶粒粒径为30nm,纳米TiO2-xNx薄膜托槽表面致密、平整,薄膜与托槽衬底结合紧密、附着性好,托槽表面粗糙度降低,摩擦系数变小,改善了托槽表面性能,为抗菌性研究奠定了基础。 相似文献
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等离子显示屏(PDP)用新型红色发光体的合成及光学特性 总被引:5,自引:3,他引:5
为开发出等离子显示屏用新型红色荧光体,研究了GdAl3(BO3)4:Eu,Gd2SiO4:Eu的紫外和真空紫外发光特性。在147nm激发下GdAl3(BO3)4:Eu^3 呈色坐标为(0.645,0.330)的强红光发射,说明是非常有前途的PDP用红色发光材料。在GdAl3(BO3)4:Eu^3 的激发光谱中,除观察到Eu^3 的电荷迁移带(峰值位于258nm)外,还观察到峰值位于155nm的宽带。依据硼酸盐的吸收数据将其归属于BO3基团的吸收。另外观察到Gd^3 8S7/2→^6I11/2跃迁(274nm)及在真空紫外(158~160nm)激发下,Eu^3 的红光发射强度随着Eu^3 浓度的增加而减弱,说明BO3基团吸收的能量经Gd^3 为媒介转移到Eu^3 。分析Gd2SiO5:Eu的激发光谱,得到Eu^3 的电荷迁移带是峰值位于256nm的宽带,峰值位于183nm的宽带可能是Gd^3 的电荷迁移带。在256nm激发下Gd2SiO5:Eu^3 呈强红光发射,但是147nm激发下很弱。这是由于真空紫外激发效率低的原因,其特点可由其晶体结构即激活离子所处的环境解释。 相似文献
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The phosphor BaB8O13:Eu3+ were synthesized by solid-state reaction, and their luminescent properties were studied under 254 and 147 nm excitation. The excitation spectrum showed two broad bands in the range of 100-300 nm: one was the host lattice absorption with the maxima at 160 nm and the other was Ba-O absorption overlapped with the CT band of Eu3+, which indicated that the energy of the host lat-tice absorption could be efficiently transferred to the Eu3+. The overlapped bands were tended to separate when monitored by different wave-length, which indicated that at least two Ba2+ sites were available in BaB8O13. The emissions of Eu3+ (612 nm) and Eu2+ (405 nm) were both observed in the emission spectra of BaB8O13:Eu3+ under the excitation of either 254 or 147 nm. With the doping concentration of Eu3+ in-creasing, the 612 nm emission was enhanced while 405 nm emission was decreased under 254 nm excitation, which was due to the persistent energy transfer from Eu2+ to Eu3+. While under 147 nm excitation, the 612 nm emission was quenched and the 405 nm emission was en-hanced. It was concluded that the preferential excitation of Eu2+ under 147 nm excitation was one of the reasons for this facts. 相似文献
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以金属硝酸盐和稀土氧化物为初始原料,柠檬酸为配位剂,采用柠檬酸-凝胶法在1000℃下制备了结晶性较好的掺杂三价铕离子的钇铝石榴石红色荧光粉,该方法比普通固相反应的烧结温度降低了约450℃。X射线衍射结果表明,合成的样品具有Y3Al5O12立方晶系晶体结构,Y3-x Eux Al5O12(0.025≤x≤0.15)的晶格参数a随x的增大而增大。通过对掺杂Y3-x Eux Al5O12(0.025≤x≤0.15)材料的激发和发射光谱研究,发现其最有效激发波长为位于240 nm左右的宽吸收带,归属于Eu3+→O2-的电荷转移跃迁(CTS),最强发射峰波长为590 nm,对应于Eu3+的5D0→7F1跃迁。柠檬酸凝胶法制备样品与固相法制备样品相比较,其发射强度较低,但红橙比较大,色纯度好。 相似文献
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在新型干法生产中,生料配料率值的稳定性对窑系统的安全稳定运行起着关键的作用,尤其是n值,其大幅度波动,最容易破坏窑的工况稳定性,使窑砖的安全运行周期缩短。在日常生产中,各种进厂原材料都经过堆场预均化,各堆物料的成分均匀性得到大幅度地提高,当所取石灰石的硅含量与辅助材料硅、铝、铁含量匹配不良时,出磨生料n、P值将发生失控现象。在常规配料模式下,当窑情发生变化或要改善熟料物理性能时,却难以快捷地调整好熟料n、P值。 相似文献
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针对光催化剂存在的光吸收效率不足、载流子易复合等关键问题,总结了本实验室从光吸收、载流子分离、表面反应、全天候光催化4个方面对光催化材料进行改性或开发新型光催化材料,探索了光催化材料在有机污染物降解、光催化产氢、产氧、尾气处理等方面的应用,基于能带理论对光催化活性的提升机理进行了解释,并对未来光催化材料的发展方向进行了展望。 相似文献
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