Results 201 to 210 of about 28,667 (255)

Water-soluble CdSe and CdSe/CdS nanocrystals: A greener synthetic route

Journal of Colloid and Interface Science, 2006
We report a new green synthetic route of CdSe and core-shell CdSe/CdS nanoparticles (NPs) in aqueous solutions. This route is performed under water-bath temperature, using Se powder as a selenium source to prepare CdSe NPs, and H(2)S generated by the reaction of Na(2)SH(2)SO(4) as a sulfur source to synthesize core-shell CdSe/CdS NPs at 25-35 degrees C.
Jun-Sheng Yu
exaly   +3 more sources

Colloidal n-Doped CdSe and CdSe/ZnS Nanoplatelets

The Journal of Physical Chemistry Letters, 2021
Colloidal semiconductor nanoplatelets (NPLs) are chemical versions of well-studied quantum wells (QWs). For QWs, gating and carrier doping are standard tools to manipulate their optical, electric, or magnetic properties. It would be highly desirable to use pure chemical methods to dope extra charge carriers into free-standing colloidal NPLs to achieve ...
Lifeng Wang, Dongmei Xiang, Kaimin Gao, Junhui Wang, Kaifeng Wu   +4 more
openaire   +2 more sources

CdSe and CdSe/CdS Nanorod Solids

Journal of the American Chemical Society, 2004
We demonstrate the self-organization of CdSe nanorods into nematic, smectic, and crystalline solids. Layered colloidal crystals of CdSe nanorods grow by slow destabilization of a nanocrystal solution upon allowing the diffusion of a nonsolvent into the colloidal solution of nanocrystals.
Dmitri V, Talapin, Elena V, Shevchenko, Christopher B, Murray, Andreas, Kornowski, Stephan, Förster, Horst, Weller   +5 more
openaire   +2 more sources

Cytotoxicity of Colloidal CdSe and CdSe/ZnS Nanoparticles

Nano Letters, 2004
Cytotoxicity of CdSe and CdSe/ZnS nanoparticles has been investigated for different surface modifications such as coating with mercaptopropionic acid, silanization, and polymer coating. For all cases, quantitative values for the onset of cytotoxic effects in serum-free culture media are given. These values are correlated with microscope images in which
Kirchner C, Liedl T, Kudera S, Pellegrino T, Javier AM, Gaub HE, Stolzle S, Fertig N, Parak WJ   +8 more
openaire   +2 more sources

Structural properties of CdSe nanocrystals in CdSe/Se multilayer

Experimental and Theoretical NANOTECHNOLOGY, 2021
CdSe/Se multilayer thin films were prepared using sequential thermal evaporation technique by varying the thickness of selenium sublayers. Identifying the prominent peaks observed in the XRD spectra of the top layer CdSe which corresponds to the (100) plane with wurtzite structure, the average size of the crystallites was calculated for the CdSe ...
null D. Simoes, null D. Silva, null D. Romero   +2 more
openaire   +1 more source

Effect of Protons on CdSe and CdSe–ZnS Nanocrystals in Organic Solution

Langmuir, 2013
Core and core-shell quantum dots are covered with a layer of organic ligands which prevents aggregation and eliminates surface defects, thus enhancing the photophysical properties and stability of the material. These ligands are usually Lewis bases and can therefore be affected by the presence of acid in the surrounding environment. We synthesized core
AVELLINI, TOMMASO, AMELIA, MATTEO, CREDI, ALBERTO, SILVI, SERENA   +3 more
openaire   +3 more sources

Exciton diffusion in CdSe

Physical Review B, 1993
In transient laser-induced grating experiments, the diffusion coefficients and lifetimes of free excitons are determined in CdSe at temperatures between 2 and 40 K and for different densities. We find that the diffusion coefficient D decreases and that the recombination lifetime ${\mathit{T}}_{1}$ increases with increasing temperature. The increase of $
, Erland, , Razbirin, , Pantke, , Lyssenko, , Hvam   +4 more
openaire   +2 more sources

PbSe/CdSe and PbSe/CdSe/ZnSe Hierarchical Nanocrystals and Their Photoluminescence

Langmuir, 2011
Multiple CdSe and ZnSe semiconductor shells were grown on PbSe semiconductor spherical cores with monolayer control. For CdSe shell coating, we found that there was little room to further increase the quantum yields of freshly-made high-quality PbSe nanocrystals that already owned very high initial values because of their good surface status; but there
Yu, Zhang, Quanqin, Dai, Xinbi, Li, Jianyu, Liang, Vicki L, Colvin, Yiding, Wang, William W, Yu   +6 more
openaire   +2 more sources

Optimized Conditions for the Self-Organization of CdSe-Au and CdSe-CdSe Binary Nanoparticle Superlattices

Chemistry of Materials, 2008
The formation process of CdSe-Au binary nanoparticle superlattices (BNSLs) was investigated to elucidate the optimal conditions for self-assembly. Nanoparticle mixtures were prepared under suitable and variable solvent evaporation conditions and the products analyzed by TEM.
Chenguang Lu, Zhuoying Chen, Stephen O’Brien   +2 more
openaire   +1 more source