Synthesis, Self-Assembly, Disassembly, and Reassembly of Two Types of Cu2O Nanocrystals Unifaceted with {001} or {110} Planes

被引:251
作者
Yao, Ke Xin [1 ,2 ]
Yin, Xiao Ming [3 ,4 ]
Wang, Tai Hong [3 ,4 ]
Zeng, Hue Chun [1 ,2 ]
机构
[1] Natl Univ Singapore, Dept Chem & Biomol Engn, KAUST NUS GCR Program, Singapore 119260, Singapore
[2] Natl Univ Singapore, Fac Engn, Minerals Met & Mat Technol Ctr, Singapore 119260, Singapore
[3] Hunan Univ, Key Lab Micronano Optoelect Devices, Minist Educ, Changsha 410082, Hunan, Peoples R China
[4] Hunan Univ, State Key Lab Chemobiosensing & Chemometr, Changsha 410082, Hunan, Peoples R China
关键词
ONE-POT SYNTHESIS; SYSTEMATIC SHAPE EVOLUTION; GAS SENSORS; CUPROUS-OXIDE; BINARY SUPERLATTICES; FACILE SYNTHESIS; HOLLOW SPHERES; NANOCUBES; CRYSTALS; CDSE;
D O I
10.1021/ja100151f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
In this work, we describe a solution-based synthesis of monodisperse Cu2O nanocrystals with controllable sizes in the nanoscale regime. Two types of nanocrystals, cubes and rhombic dodecahedra unifaceted with either {001} or {110} crystal planes, have been prepared at a 100% morphological yield. In particular, synthetic parameters and formation processes of the Cu2O nanocrystals have been investigated in detail, and a range of well-oriented supercrystals/superlattices built from the two types of nanobuilding blocks have been attained for the first time. It has been revealed that n-hexadecylamine used in the present work plays multiple roles: it serves as a chelating ligand to form [Cu(NH2C16H33)(4)](2+) complex precursor, as a phase-transferring agent to transfer divalent Cu2+ ions into the organic phase, as a reducing agent to generate monovalent Cu+ (i.e., Cu2O), as a passivating adsorbate to control crystal morphology, and as a surface capping agent to generate self-assemblies of nanocrystals via van der Waals interaction. Apart from synthesis and self-assembly, disassembly and reassembly of Cu2O nanocrystals have also been investigated. The disassembly processes are accompanied with aggregative growths of nanocrystals, which can be attributed to a combined process of "oriented attachment' and Ostwald ripening, leading to permanent engagement and enlargement of nanocrystals. Finally, our self-assembled nanocrystals of Cu2O show a lower detection limit, lower operating temperature, and higher sensitivity in ethanol vapor detection, compared with other Cu2O-based alcohol sensors reported in the recent literature. A greater depletion layer of carrier and a relatively small contact potential may account for the observed sensing enhancement in the sensors made from the organized Cu2O nanocrystals.
引用
收藏
页码:6131 / 6144
页数:14
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