利用聚苯乙烯(polystyrene,PS)纳米球刻蚀结合水热生长,制备了周期有序的δ-MnO_(2)纳米阵列。首先通过PS纳米球自组装,形成密堆积单层膜,并转移到硅(Si)衬底上。随后反应离子刻蚀(reactive ion etching,RIE)被用来减小PS纳米球的尺寸...利用聚苯乙烯(polystyrene,PS)纳米球刻蚀结合水热生长,制备了周期有序的δ-MnO_(2)纳米阵列。首先通过PS纳米球自组装,形成密堆积单层膜,并转移到硅(Si)衬底上。随后反应离子刻蚀(reactive ion etching,RIE)被用来减小PS纳米球的尺寸。然后磁控溅射铜(Cu)材料作为隔离层。将Si衬底上的PS纳米球去除后,磁控溅射MnO_(2)材料。最后通过化学腐蚀方法去除Cu膜,使覆盖在Cu表面的MnO_(2)一起去除,从而得到用于后续水热生长的周期有序排布的MnO_(2)种子位点。制备不同周期的纳米阵列,可通过选择不同直径的PS纳米球获得。通过扫描电子显微镜(scanning electron microscopy,SEM)确认了周期为500和800 nm纳米阵列的形成。利用X射线衍射(X-ray diffraction,XRD)方法确认了阵列中MnO_(2)材料为δ相。本研究为制备半导体材料的有序结构提供了一种新的方法。展开更多
Recent advances in the nanomaterials, such as luminescent quantum dots, latex fluorescent nanospheres and dye-doped silica nanoparticles, have opened a promising field toward the development of luminescent biolabel. I...Recent advances in the nanomaterials, such as luminescent quantum dots, latex fluorescent nanospheres and dye-doped silica nanoparticles, have opened a promising field toward the development of luminescent biolabel. In this paper, we develop a kind of novel nanometer-sized fluorescent hybrid silica(NFHS) particles used as a sensitive and photostable fluorescent probe in biological staining and diagnostics. The NFHS particles are prepared by controlled hydrolysis of the fluorophore silica precursor using the reverse micelle technique. The fluorophores are dispersed homogeneously in the silica network of the NFHS particles and well protected from the environmental oxygen. In comparison with single organic fluorophores without incorporation, these nanoparticle probes are brighter, more stable against photobleaching and do not suffer from intermittent on/off light emission(blinking). The NFHS particles have also shown unique advantages over the existing common organic fluorophores, quantum dots, and latex-based fluorescent particles for biomolecule recognition in the following four major points: easy preparation, good photostability, high sensitivity, and low toxicity. The approach proposed in this article for making NFHS nanoparticles is a general one, and it is not restricted to a particular type of fluorophore molecule as selected in this study.展开更多
文摘利用聚苯乙烯(polystyrene,PS)纳米球刻蚀结合水热生长,制备了周期有序的δ-MnO_(2)纳米阵列。首先通过PS纳米球自组装,形成密堆积单层膜,并转移到硅(Si)衬底上。随后反应离子刻蚀(reactive ion etching,RIE)被用来减小PS纳米球的尺寸。然后磁控溅射铜(Cu)材料作为隔离层。将Si衬底上的PS纳米球去除后,磁控溅射MnO_(2)材料。最后通过化学腐蚀方法去除Cu膜,使覆盖在Cu表面的MnO_(2)一起去除,从而得到用于后续水热生长的周期有序排布的MnO_(2)种子位点。制备不同周期的纳米阵列,可通过选择不同直径的PS纳米球获得。通过扫描电子显微镜(scanning electron microscopy,SEM)确认了周期为500和800 nm纳米阵列的形成。利用X射线衍射(X-ray diffraction,XRD)方法确认了阵列中MnO_(2)材料为δ相。本研究为制备半导体材料的有序结构提供了一种新的方法。
文摘Recent advances in the nanomaterials, such as luminescent quantum dots, latex fluorescent nanospheres and dye-doped silica nanoparticles, have opened a promising field toward the development of luminescent biolabel. In this paper, we develop a kind of novel nanometer-sized fluorescent hybrid silica(NFHS) particles used as a sensitive and photostable fluorescent probe in biological staining and diagnostics. The NFHS particles are prepared by controlled hydrolysis of the fluorophore silica precursor using the reverse micelle technique. The fluorophores are dispersed homogeneously in the silica network of the NFHS particles and well protected from the environmental oxygen. In comparison with single organic fluorophores without incorporation, these nanoparticle probes are brighter, more stable against photobleaching and do not suffer from intermittent on/off light emission(blinking). The NFHS particles have also shown unique advantages over the existing common organic fluorophores, quantum dots, and latex-based fluorescent particles for biomolecule recognition in the following four major points: easy preparation, good photostability, high sensitivity, and low toxicity. The approach proposed in this article for making NFHS nanoparticles is a general one, and it is not restricted to a particular type of fluorophore molecule as selected in this study.
