总被引：1，自引：0，他引：1  

Choi H  Park JS  Jeong E  Kim GH  Lee BR  Kim SO  Song MH  Woo HY  Kim JY 《Advanced materials (Deerfield Beach, Fla.)》2011,23(24):2759-2763

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Kim TY  Kwon SW  Park SJ  Yoon DH  Suh KS  Yang WS 《Advanced materials (Deerfield Beach, Fla.)》2011,23(24):2734-2738

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Son JS  Yu JH  Kwon SG  Lee J  Joo J  Hyeon T 《Advanced materials (Deerfield Beach, Fla.)》2011,23(28):3214-3219

2D semiconductor quantum wells have been recognized as potential candidates for various quantum devices. In quantum wells, electrons and holes are spatially confined within a finite thickness and freely move in 2D space. Much effort has focused on shape control of colloidal semiconductor nanocrystals(NCs), and synthesis of 2D colloidal NCs has been achieved very recently. Here, recent advances in colloidal synthesis of uniform and ultrathin 2D CdSeNCs are highlighted. Structural and optical property characterization of these quantum-sized 2D CdSe NCs is discussed. Additionally, 2D CdSe NCs doped with Mn 2+ ions for dilute magnetic semiconductors (DMS) are presented.These 2D CdSe-based NCs can be used as model systems for studying quantum-well structures.  相似文献   

    

Yun Zhang  Huamin Zhou  Jianhui Li  Wei Feng  Dequn Li 《International journal for numerical methods in engineering》2011,86(12):1413-1434

The formulation, implementation and testing of simple, efficient and robust shell finite elements have challenged investigators over the past four decades. A new 3‐node flat triangular shell element is developed by combination of a membrane component and a plate bending component. The ANDES‐based membrane component includes rotational degrees of freedom, and the refined nonconforming element method‐based bending component involves a transverse shear correction. Numerical examples are carried out for benchmark tests. The results show that compared with some popular shell elements, the present one is simple but exhibits excellent all‐around properties (for both membrane‐and bending‐dominated situations), such as free of aspect ratio locking, passing the patch test, free of shear locking, good convergence and high suitability for thin to moderately thick plates. The developed element has already been adopted in a warpage simulation package for injection molding. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

    

Son JS  Park K  Kwon SG  Yang J  Choi MK  Kim J  Yu JH  Joo J  Hyeon T 《Small (Weinheim an der Bergstrasse, Germany)》2012,8(15):2394-2402

The dimension-controlled synthesis of CdS nanocrystals in the strong quantum confinement regime is reported. Zero-, one-, and two-dimensional CdS nanocrystals are selectively synthesized via low-temperature reactions using alkylamines as surface-capping ligands. The shape of the nanocrystals is controlled systematically by using different amines and reaction conditions. The 2D nanoplates have a uniform thickness as low as 1.2 nm. Furthermore, their optical absorption and emission spectra show very narrow peaks indicating extremely uniform thickness. It is demonstrated that 2D nanoplates are generated by 2D assembly of CdS magic-sized clusters formed at the nucleation stage, and subsequent attachment of the clusters. The stability of magic-sized clusters in amine solvent strongly influences the final shapes of the nanocrystals. The thickness of the nanoplates increases in a stepwise manner while retaining their uniformity, similar to the growth behavior of inorganic clusters. The 2D CdS nanoplates are a new type of quantum well with novel nanoscale properties in the strong quantum confinement regime.  相似文献   

    

Linda Lee Ho  Roberto da Costa Quinino  Anderson Laécio Galindo Trindade 《Quality and Reliability Engineering International》2011,27(8):1087-1093

The np‐control chart has been used to monitor the conforming fraction in process production, and it is assumed that no classification errors occur during the inspection process. Increases in the sample size and/or the number of repeated classifications of the inspected items can reduce the impact of the classification errors. In this paper, an np ‐control chart is proposed, and the monitored statistics are based on the results of independent repeated classifications with classification errors during the inspection process. The aim of the proposed control chart is to have the same performance as a control chart without classification errors. Numerical examples illustrate the proposal. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献   

    

Truong TT  Qin Y  Ren Y  Chen Z  Chan MK  Greeley JP  Amine K  Sun Y 《Advanced materials (Deerfield Beach, Fla.)》2011,23(42):4947-4952

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Lee SH  Zhang XG  Parish CM  Lee HN  Smith DB  He Y  Xu J 《Advanced materials (Deerfield Beach, Fla.)》2011,23(38):4381-4385

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Na Young Ha  Soon Moon Jeong  Suzushi Nishimura  Hideo Takezoe 《Advanced materials (Deerfield Beach, Fla.)》2010,22(14):1617-1621

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Chang Hoon Lee  Young‐Wan Kwon  Dong Hoon Choi  Yves Henri Geerts  EuiKwan Koh  Jung‐Il Jin 《Advanced materials (Deerfield Beach, Fla.)》2010,22(39):4405-4409

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