http://dspace.cus.ac.in/jspui/handle/1/6350 2026-04-13T15:22:11Z 2026-04-13T15:22:11Z Reiss, Peter Carrière, Marie Lincheneau, Christophe Vaure, Louis Tamang, Sudarsan http://dspace.cus.ac.in/jspui/handle/1/6357 2019-09-24T20:30:51Z 2016-01-01T00:00:00Z

Title: Synthesis of semiconductor nanocrystals, focusing on nontoxic and earth-abundant materials Authors: Reiss, Peter; Carrière, Marie; Lincheneau, Christophe; Vaure, Louis; Tamang, Sudarsan Abstract: We review the synthesis of semiconductor nanocrystals/colloidal quantum dots in organic solvents with special emphasis on earth-abundant and toxic heavy metal free compounds. Following the Introduction, section 2 defines the terms related to the toxicity of nanocrystals and gives a comprehensive overview on toxicity studies concerning all types of quantum dots. Section 3 aims at providing the reader with the basic concepts of nanocrystal synthesis. It starts with the concepts currently used to describe the nucleation and growth of monodisperse particles and next takes a closer look at the chemistry of the inorganic core and its interactions with surface ligands. Section 4 reviews in more detail the synthesis of different families of semiconductor nanocrystals, namely elemental group IV compounds (carbon nanodots, Si, Ge), III–V compounds (e.g., InP, InAs), and binary and multinary metal chalcogenides. Finally, the authors’ view on the perspectives in this field is given.

2016-01-01T00:00:00Z Tamang, Sudarsan Lee, Sunghee Choi, Hyekyoung Jeong, Sohee http://dspace.cus.ac.in/jspui/handle/1/6356 2019-09-24T20:30:10Z 2016-01-01T00:00:00Z

Title: Tuning size and size distribution of colloidal InAs nanocrystals via continuous supply of prenucleation clusters on nanocrystal seeds Authors: Tamang, Sudarsan; Lee, Sunghee; Choi, Hyekyoung; Jeong, Sohee

2016-01-01T00:00:00Z Tamang, Sudarsan Lincheneau, Christophe Hermans, Yannick Jeong, Sohee Reiss, Peter http://dspace.cus.ac.in/jspui/handle/1/6355 2019-09-24T20:30:53Z 2016-01-01T00:00:00Z

Title: Chemistry of InP nanocrystal syntheses Authors: Tamang, Sudarsan; Lincheneau, Christophe; Hermans, Yannick; Jeong, Sohee; Reiss, Peter Abstract: Chemically synthesized InP nanocrystals (NCs) are drawing a large interest as a potentially less toxic alternative to CdSe-based nanocrystals. With a bulk band gap of 1.35 eV and an exciton Bohr radius of ∼10 nm the emission wavelength of InP NCs can in principle be tuned throughout the whole visible and near-infrared range by changing their size. Furthermore, a few works reported fluorescence quantum yields exceeding 70% after overcoating the core NCs with appropriate shell materials. Therefore, InP NCs are very promising for use in lighting and display applications. On the other hand, a number of challenges remain to be addressed in order to progress from isolated research results to robust and reproducible synthesis methods for high quality InP NCs. First of all, the size distribution of the as-synthesized NCs needs to be reduced, which directly translates into more narrow emission line widths. Next, reliable protocols are required for achieving a given emission wavelength at high reaction yield and for further improving the emission efficiency and chemical and photostability. Advances in these directions have been hampered for a long time by the specific properties of InP, such as the rather covalent nature of binding implying harsh synthesis conditions, high sensitivity toward oxidation, and limited choice of phosphorus precursors. However, in recent years a much better understanding of the precursor conversion kinetics and reaction mechanisms has been achieved, giving this field new impulse. In this review we provide a comprehensive overview from initial synthetic approaches to the most recent developments. First, we highlight the fundamental differences in the syntheses of InP-based NCs with respect to established II–VI and IV–VI semiconductor NCs comparing their nucleation and growth stages. Next, we inspect in detail the influence of the nature of the phosphorus and indium precursors used and of reaction additives, such as zinc carboxylates or alkylamines, on the properties of the NCs. Finally, core/shell systems and doped InP NCs are discussed, and perspectives in this field are given.

2016-01-01T00:00:00Z Tamang, Sudarsan Kim, Kyungnam Choi, Hyekyoung Kima, Youngsik Jeong, Sohee http://dspace.cus.ac.in/jspui/handle/1/6352 2019-09-24T20:30:52Z 2015-01-01T00:00:00Z

Title: Synthesis of colloidal InSb nanocrystals via in situ activation of InCl3 Authors: Tamang, Sudarsan; Kim, Kyungnam; Choi, Hyekyoung; Kima, Youngsik; Jeong, Sohee Abstract: Indium antimonide (InSb), a narrow band gap III–V semiconductor is a promising infrared-active material for various optoelectronic applications. Synthetic challenge of colloidal InSb nanocrystals (NCs) lies in the limited choice of precursors. Only a few successful synthetic schemes involving highly toxic stibine (SbH3) or air- and moisture-sensitive metal silylamides (In[N(Si-(Me)3)2]3 or Sb[N(Si-(Me)3)2]3) as the precursor have been reported. We found that commercially available precursors InCl3 and Sb[NMe2]3 directly form highly crystalline colloidal InSb nanocrystals in the presence of a base such as LiN(SiMe3)2 or nBuLi. The mean size of the particles can be controlled by simply changing the activating base. This approach offers a one-pot synthesis of InSb NCs from readily available chemicals without the use of complex organometallic precursors

2015-01-01T00:00:00Z