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| 1 | Highly reactive, flexible yet green Se precursor for metal selenide nanocrystals: Se-octadecene suspension (Se-SUS)显示文摘在 octadecene (Se 怀疑) 的好硒粉末(100 或 200 网孔) 的暂停证明了是一位高效的、万用的、方便的、可再现的、还绿的硒先锋。Se 怀疑的优点从它的高度反应的化学性质和灵活性产生。这二个特征使与多样的作文和结构执行高质量的金属硒化物 nanocrystals 的合成可能,包括二进制代码,核心 / 壳,做的转变金属,和复杂作文 nanocrystals。这些成功进一步证明 Se 怀疑是为在高质量的硒化物 nanocrystals 的合成解决一些长期的挑战的一位强大的 Se 先锋。例如,Se怀疑成功地作为一位 Se 先锋被采用因为在高质量的核心/壳 nanocrystals 轰炸生长代替昂贵、高度有毒的先锋,例如Se磷化氢和 bis-trimethylsilyl 硒化物,与极大地降低的取向附生的温度(象 150 一样低???????????????? | Chaodan Pu Jianhai Zhou Runchen Lai Yuan Niu Wennuan Nan Xiaogang Peng | 2013 | Nano Research2013，6，9： | 12 |
| 2 | Surface and intrinsic contributions to extinction properties of ZnSe quantum dots显示文摘This work studies extinction properties of ZnSe quantum dots terminated with either Se-surface or Zn-surface(Se-ZnSe or Zn-ZnSe QDs).In addition to commonly observed photoluminescence quenching by anionic surface sites,Se-ZnSe QDs are found to show drastic signatures of Se-surface states in their UV-visible(Vis)absorption spectra.Similar to most QDs reported in literature,monodisperse Zn-ZnSe QDs show sharp absorption features and blue-shifted yet steep absorption edge respect to the bulk bandgap.However,for monodisperse Se-ZnSe QDs,all absorption features are smeared and a low-energy tail is identified to extend to an energy window below the bulk ZnSe bandgap.Along increasing their size,a cyclic growth of ZnSe QDs switches their surface from Zn-terminated to Se-terminated ones,which confirms that the specific absorption signatures are reproducibly repeated between those of two types of the QDs.Though the extinction coefficients per unit of Se-ZnSe QDs are always larger than those of Zn-ZnSe QDs with the same size,both of them approach the same bulk limit.In addition to contribution of the lattice,extinction coefficients per nanocrystal of Zn-ZnSe QDs show an exponential term against their sizes,which is expected for quantum-confinement enhancement of electron-hole wavefunction overlapping.For Se-ZnSe QDs,there is the third term identified for their extinction coefficients per nanocrystal,which is proportional to the square of size of the QDs and consistent with surface contribution. | Shangxin Lin Jiongzhao Li Chaodan Pu Hairui Lei Meiyi Zhu Haiyan Qin Xiaogang Peng | 2020 | Nano Research2020，13，3： | 5 |
| 3 | One-pot/three-step synthesis of zinc-blende CdSe/CdS core/shell nanocrystals with thick shells显示文摘A one-pot/three-step synthetic scheme was developed for phase-pure epitaxy of CdS shells on zinc-blende CdSe nanocrystals to yield shells with up to sixteen monolayers. The key parameters for the epitaxy were identified, including the core nanocrystal concentration, solvent type/composition, quality of the core nanocrystals, epitaxial growth temperature, type/concentration of ligands, and composition of the precursors. Most of these key parameters were not influential when the synthetic goal was thin-shell CdSe/CdS core/shell nanocrystals. The finalized synthetic scheme was reproducible at an almost quantitative level in terms of the crystal structure, shell thickness, and optical properties. | Yuan Niu Chaodan Pu Runchen Lai Renyang Meng Wanzhen Lin Haiyan Qin Xiaogang Peng | 2017 | Nano Research2017，10，4： | 3 |
| 4 | Surface activation of colloidal indium phosphide nanocrystals显示文摘对在结晶化的一般智慧, InP 和 III-V 量点(QD ) 的成核经常统治他们的生长。InP QD 上的系统的研究为这识别了关键原因:在每 nanocrystal 附近的稠密、紧密的 alkanoate-ligand 壳。不同策略被探索启用必要 ligand dynamicsi.e,很快在被结合到并且在热 agitationon nanocrystals 之上从 nanocrystal 分开了同时保留胶体的稳定性并且允许可估计的生长之间切换的 ligands。在测试的所有表面激活试剂之中, 2,4-diketones (例如 acetylacetone ) 作为先锋与铟 alkanoates 和 trimethylsilylphosphine 允许 InP QD 的完整的生长。当小时丰满的酸(例如醋酸) 部分活跃的、普通中立 ligands (例如丰满的胺, organophosphines,和磷化氢氧化物) 显示出的有限激活效果。存在 InP QD 的基于胺的合成被在 situ 形成的醋酸激活。有普通先锋的表面激活与在 ~ 之间的一座可区分的吸收山峰启用了 InP QD 的生长在温和温度的 450 和 650 nm (140-180 ' | Yang Li Chaodan Pu Xiaogang Peng | 2017 | Nano Research2017，10，3： | 3 |
| 5 | Efficient quasi-stationary charge transfer from quantum dots to acceptors physically-adsorbed in the ligand monolayer显示文摘Alkanoate-coated CdSe/CdS core/shell quantum dots(QDs)with near-unity photoluminescence(PL)quantum yield and monoexponential PL decay dynamics are applied for studying quasi-stationary charge transfer from photo-excited QDs to quinone derivatives physically-adsorbed within the ligand monolayer of a QD.Though PL quenching efficiency due to electron transfer can be up to>80%,transient PL and transient absorption spectra reveal that the charge transfer rate ranges from single-digit nanoseconds to sub-nanoseconds,which is~3 orders of magnitude slower than that of static charge transfer and〜2 orders of magnitude faster than that of collisional charge transfer.The physically-adsorbed acceptors can slowly(500-1,000 min dependent on the size of the quinone derivatives)desorb from the ligand monolayer after removal of the free acceptors.Contrary to collisional charge transfer,the efficiency of quasi-stationary charge transfer increases as the ligand length increases by providing additional adsorption compartments in the elongated hydrocarbon chain region.Because ligand monolayer commonly exists for a typical colloidal nanocrystal,the quasi-stationary charge transfer uncovered here would likely play an important role when colloidal nanocrystals are involved in photocatalysis,photovoltaic devices,and other applications related to photo-excitation. | Lei Yang Xiaoqi Zhou Yuzhong Chen Yufeng Qin Xueqian Kong Haiming Zhu Chaodan Pu Xiaogang Peng | 2022 | Nano Research2022，15，1： | 1 |
| 6 | Size focusing of colloidal quantum dots under high monomer concentration显示文摘The diffusion-controlled growth mode is widely used to narrow the size distribution of colloidal quantum dots.However,this growth mode always suffers from size broadening at the later growth stage.By monitoring the growth process of CdS colloidal quantum dots,we show the size broadening is a result of different growth rates of CdS colloidal quantum dots(CQDs)with different morphologies.Monomer concentration-dependent growth experiments demonstrate the different growth rates are caused by the different ligand permeabilities of CdS CQDs.The cubic ones have lower ligand permeability but higher saturated surface reaction rate than the noncubic ones,leading to unexpected narrower size distribution under higher monomer concentration.More efficient narrowing can be obtained by the addition of chloride ions,which can increase the ligand permeability of all CdS CQDs,as well as the opposite discrepancies in ligand permeability and surface reaction between cubic and noncubic CdS CQDs.The photoluminescence(PL)full width at half maximum(FWHM)of CdS CQDs can be narrowed down to below 80 meV for PL peaks from 430 to 500 nm.Given the inevitable usage of the ligands in the solution synthesis of colloidal nanocrystals,the influence of morphology difference on growth rate should be common.Our results can provide an alternative solution to realize size focusing for the synthesis of colloidal nanocrystals. | Huiyan Liu Zhi Liu Chaodan Pu | 2022 | Nano Research2022，15，8： | 0 |
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