Designing PbSe nanowires and nanorings through oriented attachment of nanoparticles
Designing PbSe nanowires and nanorings through oriented attachment of nanoparticles
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DOI：
10.1021/ja050107s
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发表时间：
2005-05-18
影响因子：
15
通讯作者：
Murray, CB
中科院分区：
文献类型：
--
作者：
Cho, KS;Talapin, DV;Murray, CB
在溶液中，通过定向附着PbSe结构单元，合成了单晶PbSe纳米线。190-250 ℃的反应温度和多组分表面活性剂混合物导致几乎无缺陷的晶格和纳米线直径沿整个长度沿着的高度均匀性。通过调整反应条件，可以调整金属丝的尺寸，使其直径在约4至约20纳米的范围内，金属丝的长度可达约30微米。PbSe纳米晶体在{100}、{110}或{111}面上彼此结合，这取决于反应溶液中存在的表面活性剂分子。虽然PbSe纳米晶体具有中心对称的岩盐晶格，但由于Pb和Se封端的{111}面的非中心对称排列，它们可能缺乏中心对称性，并且具有偶极子驱动纳米晶体的一维取向附着以形成纳米线。除了直的纳米线，锯齿形，螺旋形，分支和锥形纳米线以及单晶纳米环可以可控地制备在一锅反应通过仔细调整反应条件。
Single-crystal PbSe nanowires are synthesized in solution through oriented attachment of nanocrystal building blocks. Reaction temperatures of 190-250 degrees C and multicomponent surfactant mixtures result in a nearly defect-free crystal lattice and high uniformity of nanowire diameter along the entire length. The wires' dimensions are tuned by tailoring reaction conditions in a range from similar to 4 to similar to 20 nm in diameter with wire lengths up to similar to 30 mu m. PbSe nanocrystals bind to each other on either {100}, {110}, or {111} faces, depending on the surfactant molecules present in the reaction solution. While PbSe nanocrystals have the centrosymmetric rocksalt lattice, they can lack central symmetry due to a noncentrosymmetric arrangement of Pb- and Se-terminated {111} facets and possess dipole driving one-dimensional oriented attachment of nanocrystals to form nanowires. In addition to straight nanowires, zigzag, helical, branched, and tapered nanowires as well as single-crystal nanorings can be controllably prepared in one-pot reactions by careful adjustment of the reaction conditions.