PbSe quantum dots fiber amplifier based on sol-gel self-assembly method

2010 ◽  
Author(s):  
Xiaolan Sun ◽  
Yanhua Dong ◽  
Chao Li ◽  
Xiaohong Liu ◽  
Guangyao Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Sol Gel ◽  
Fiber Amplifier ◽  
Assembly Method

PbSe quantum dots fiber amplifier based on sol-gel self-assembly method

2010 ◽  
Author(s):  
Xiaolan Sun ◽  
Yanhua Dong ◽  
Chao Li ◽  
Xiaohong Liu ◽  
Guangyao Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Sol Gel ◽  
Fiber Amplifier ◽  
Assembly Method

SiO2 Beads with Quantum Dots: Synthesis and Bioapplication

2011 ◽  
Vol 306-307 ◽  
pp. 16-19
Author(s):  
Ping Yang ◽  
Norio Murase ◽  
Ai Yu Zhang ◽  
Yong Qiang Cao ◽  
Yuan Na Zhu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Ligand Exchange ◽  
Colloidal Solution ◽  
Phase Transfer ◽  
Shell Growth ◽  
Sol Gel ◽  
High Brightness ◽  
Potential Use ◽  
Poor Solvent

Aqueous CdTe and organic CdSe/ZnS quantum dots (QDs) were encapsulated into SiO2beads using various controlled sol-gel processes. Ligand exchange is a key to adjust the QD number in each bead and get a high photoluminescence (PL). Namely, partial ligand exchange from thioglycolic acid to 3-mercaptopropyotrimethoxysilane (MPS) on the CdTe QDs enables retention of the initial PL efficiency of the QDs in water, while the simultaneous addition of a poor solvent (ethanol) resulted in regulated assembly of the QDs through condensation of hydrolyzed MPS. SiO2beads thus prepared had, for example, a diameter of 17 nm and contained 3 QDs each. The PL efficiency of these beads was 30%, while the initial PL efficiency was 38% in a colloidal solution. In addition, a method including surface silanization, phase transfer and self-assembly, and SiO2shell growth has been developed to incorporate multiple hydrophobic CdSe/ZnS QDs into SiO2beads where they are well suited for bio-application due to their high brightness, less-cytotoxic, and non-blinking nature. To investigate the potential use for labeling in bio-applications, SiO2beads with multiple QDs were conjugated with IgG using streptavidin-maleimide as linkers. This preparation method is an important step towards fabricating intensely emitting biocompatible SiO2beads impregnated with semiconductor QDs.

Self-Assembly of Au Nanoparticles and Quantum Dots by Functional Sol–Gel Silica Layers

2018 ◽  
Vol 18 (1) ◽  
pp. 288-295 ◽  
Author(s):  
Simin Lu ◽  
Meng Li ◽  
Debao Liu ◽  
Yuntao Yang ◽  
Ping Yang
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Au Nanoparticles ◽  
Sol Gel ◽  
Silica Layers

Frictional Characteristics of Mesoporous SiO2 Thin Film Formed by Sol-Gel and Self-Assembly Method

2007 ◽  
Author(s):  
Yun-Ha Shin ◽  
Hong-Gyu Jeon ◽  
Jeong-Kuk Son ◽  
Ji-Man Kim ◽  
Tae-Sung Kim ◽  
...  
Keyword(s):  
Thin Films ◽  
Pore Size ◽  
Self Assembly ◽  
Sol Gel ◽  
Wear Particle ◽  
Porous Films ◽  
Sio2 Thin Film ◽  
Assembly Method ◽  
Glass Specimen ◽  
Mesoporous Sio2

Frictional characteristics of mesoporous SiO2 thin films were evaluated with different pore sizes. The films were manufactured by sol-gel and self-assembly methods to have a porous structure. The pores on the surface may play as the outlet of wear particle and the storage of lubricant so that the surface interactions could be improved. The pores were exposed on the surface by chemical mechanical polishing (CMP) or plasma-etching after forming the porous films. The ball-on-disk tests with mesoporous SiO2 thin films on glass specimen were conducted at sliding speed of 15rpm and a load of 0.26N. The results show considerable dependency of friction on pore size of mesoporous SiO2 thin films. The friction coefficient decreased as increasing the pore size. CMP process was very useful to expose the pores on the surface.

Producing the Controlled Hybrid Lattice of Natural Protein Nanotubes by Chemical Hydrolysis for Nanomedicine

2012 ◽  
Vol 21 ◽  
pp. 7-13 ◽  
Author(s):  
Pegah Esmaeilzadeh ◽  
Zahra Fakhroueian ◽  
Pouriya Esmaeilzadeh
Keyword(s):  
Self Assembly ◽  
Ph Value ◽  
Drug Loading ◽  
Sol Gel ◽  
High Capacity ◽  
Thermal Resistivity ◽  
Partial Hydrolysis ◽  
Natural Protein ◽  
Assembly Method ◽  
Protein Nanotubes

This work was instigated by the fact that sol-gel chemistry provides a relatively simple way to incorporate recognition species in a stable host green environment. In this new strategy, which represents a low cost example of bottom-up nanoassembly, chemistry art is entering the field of nanobiotechnology in fabrication and control of an expanded homogeneous length of separate single-walled and ordered, helical lattice-like open-ended natural protein nanotubes (PNTs) and also creative novel bio-nanohybrids. A new type of protein nanohybrids containg nanotubes-nanorods, nanotubes-nanofibers, nanotubes core-shell nanofibers were prepared using an electrostatic self-assembly method with the aid of chemical partial hydrolysis of milk protein α-lactalbumin (sol-gel technique) at a suitable pH value for the first time. They can have long helically coiled length and are promising for high capacity drug loading and applying in nanomedicine as organ transplantation in human body and implant material, because of their improved stability and unique mechanical and lattice thermal resistivity properties. In this study, various valuable ligand or binding sites such as distinct Mn+2, Ca+2or Zn+2 cations were used for incorporated into protein nanostructures as the self-assembly essential stimulant motor. It was found that the designed nanobioproducts could retain and stabilize as very clear and transparent green aqueous nanobiofluids during two years.

Highly Luminescent Glass Films Incorporating Hydrophobic Quantum Dots Prepared by Layer-by-layer Self-assembly Method

2016 ◽  
Vol 45 (1) ◽  
pp. 10-12 ◽  
Author(s):  
Xiaohui Liu ◽  
Jing Han ◽  
Weina Wu ◽  
Qian Shi ◽  
Wei Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Layer By Layer ◽  
Assembly Method ◽  
Glass Films

Measuring photoluminescence spectra of self-assembly array nanowire of colloidal CdSe quantum dots using scanning near-field optics microscopy

2016 ◽  
Vol 09 (03) ◽  
pp. 1650040 ◽  
Author(s):  
Zhongchen Bai ◽  
Licai Hao ◽  
Zhengping Zhang ◽  
Shuijie Qin
Keyword(s):  
Quantum Dots ◽  
Self Assembly ◽  
Near Field ◽  
Porous Titanium ◽  
Periodic Array ◽  
Main Peak ◽  
Cdse Quantum Dots ◽  
Cdse Qds ◽  
Near Field Optics ◽  
Assembly Method

A novel periodic array CdSe nanowire is prepared on a substrate of the porous titanium dioxide by using a self-assembly method of the colloidal CdSe quantum dots (QDs). The experimental results show that the colloidal CdSe QDs have renewedly assembled on its space scale and direction in process of losing background solvent and form the periodic array nanowire. The main peak wavelength of Photoluminescence (PL) spectra, which is measured by using a 100-nm aperture laser beam spot on a scanning near-field optics microscopy, has shifted 60 nm with compared to the colloidal CdSe QDs. Furthermore, we have measured smaller ordered nanometer structure in thin QDs area as well, a 343-nm periodic nanowire in thick QDs area and the colloidal QDs in edge of well-ordered nanowire.

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