Morphology control of PbWO4 nano- and microcrystals via a simple, seedless, and high-yield wet chemical route
Morphology control of PbWO4 nano- and microcrystals via a simple, seedless, and high-yield wet chemical route
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DOI：
10.1021/la035578b
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发表时间：
2004-02-17
期刊：
影响因子：
3.9
通讯作者：
Zhu, YJ
中科院分区：
文献类型：
--
作者：
Hu, XL;Zhu, YJ
目前，在介观水平上控制纳米结构的尺寸和维度是研究人员面临的最具挑战性的问题之一。1-6具体而言，一维（1D）无机纳米和微晶的研究在过去几年中引起了人们的广泛关注，因为它们在理解性质对尺寸和维度的依赖性以及它们的新颖性质和在制造纳米级电子，光电和传感器件中的潜在应用方面具有根本的重要性。7-10一维纳米结构的一些独特和迷人的特性，如更高的发光效率，已经被证明。9由于量子限制效应，当一维纳米结构的直径接近临界值时，它们表现出独特的光学性质（例如，带隙能量的偏移）。[11]例如，Korgel及其同事发现，与体硅相比，硅纳米线的吸收边明显蓝移（间接带隙为1.1 eV），并显示出相对较强的“带边”光致发光（PL）。11 Lieber及其同事报道，在平行于和垂直于单个InP纳米线的纵轴的方向上测量的PL强度存在显著的各向异性。12此外，Yang团队已经成功地展示了在蓝宝石衬底上生长的ZnO纳米线阵列的室温紫外激光。10
Currently, controlling the size and dimensionality of nanostructures at the mesoscopic level is one of the most challenging issues faced by researchers. 1-6 Specifically, research on one-dimensional (1D) inorganic nano-and microcrystals has attracted much attention during the past few years because of their fundamental importance in understanding the dependence of properties on the size and dimensionality as well as their novel properties and potential applications in fabricating nanoscale electronic, optoelectronic, and sensing devices. 7-10 Some unique and fascinating properties, such as higher luminescence efficiency, of 1D nanostructures have already been demonstrated. 9 As a result of the quantum confinement effect, 1D nanostructures exhibit distinct optical properties (eg, the shift of band gap energies) when their diameter approaches a critical value. 11 For example, Korgel and co-workers found that the absorption edge of Si nanowires was significantly blue-shifted as compared with bulk silicon (indirect band gap of∼ 1.1 eV) and showed relatively strong “band edge” photoluminescence (PL). 11 Lieber and co-workers reported that there exists a striking anisotropy in PL intensities measured in the direction parallel and perpendicular to the longitudinal axis of an individual InP nanowire. 12 In addition, the Yang group has successfully demonstrated room-temperature ultraviolet lasing from arrays of ZnO nanowires grown on a sapphire substrate. 10