Preparation and characterization of ZnS nanoparticles prepared by hydrothermal method

ZnS nanoparticles were prepared by hydrothermal method using zinc nitrate [Zn(NO[Formula: see text] ⋅ 6H2O] and thiourea [SC(NH[Formula: see text]] as sources of Zn[Formula: see text] and S[Formula: see text] ions and cetyltrimethyl ammonium bromide [CH3(CH2)[Formula: see text]N[Formula: see text](CH3)3 ⋅ Br[Formula: see text]; CTAB] as a surface active agent. The structural, surface morphology and optical properties of ZnS nanoparticles as a function of growth temperature were investigated. The studies show that ZnS nanoparticles have high transmittance over 70% in the visible light range of 400–800 nm, and it has a strong green emission band at about 520 nm which originates from the recombination of electrons from the energy level of sulfur vacancies with the holes from the energy level of zinc vacancies. With the increase of the growth temperature, the XRD peak intensity and the size of ZnS nanoparticles increase, while the green emission intensity firstly increases and then decreases.

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Impacts of Surface-Active Agents on the Crystal Structure of Nano Manganese Oxide

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.798-799.125 ◽

2013 ◽

Vol 798-799 ◽

pp. 125-129

Author(s):

Fu Yun Li ◽

Jing Wang ◽

Ying Yang Qin ◽

Li Zhen Yang

Keyword(s):

Crystal Structure ◽

Manganese Oxide ◽

Hydrothermal Method ◽

Manganese Oxides ◽

Surface Active Agent ◽

Active Agent ◽

Tween 80 ◽

Surface Active Agents ◽

Surface Active ◽

Addition Amount

The nano manganese oxides were prepared with the hydrothermal method by adding surface-active agent. The influence of the type and addition amount of surface-active agent on the preparation of nano manganese oxides was studied. The products were characterized with XRD. Experimental results show that MnOOH is obtained at 180°C with the addition of N,N,N-trimethyl-1-dodecanaminium bromide, and Mn3O4is obtained at 180 °C with OP Emulsifier or Tween-80 added. Different addition amount of surface-active agent would have diverse effects on the purity of products.

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Synthesis and photoluminescence properties of silica-modified SiO 2 @ANA-Si-Tb@SiO 2 , SiO 2 @ANA-Si-Tb-L@SiO 2 core–shell–shell nanostructured composites

Royal Society Open Science ◽

10.1098/rsos.190182 ◽

2019 ◽

Vol 6 (8) ◽

pp. 190182

Author(s):

Lina Feng ◽

Wenxian Li ◽

Jinrong Bao ◽

Yushan Zheng ◽

Yilian Li ◽

...

Keyword(s):

Surface Active Agent ◽

Active Agent ◽

Organic Ligand ◽

Ammonium Bromide ◽

Core Shell ◽

Organic Complex ◽

Chemical Route ◽

Covalent Bonds ◽

Nanostructured Composites ◽

The Core

Three novel core–shell nanostructured composites SiO 2 @ANA-Si-Tb, SiO 2 @ANA-Si-Tb-L (L = second ligand) with SiO 2 as the core and terbium organic complex as the shell were successfully synthesized. The core and shell were connected together by covalent bonds. The terbium ion was coordinated with organic ligand-forming terbium organic complex in the shell layer. The organosilane (HOOCC 5 H 4 NN(CONH(CH 2 ) 3 Si(OCH 2 CH 3 ) 3 ) 2 (abbreviated as ANA-Si) was used as the first ligand and 1,10-phenanthroline (phen) or 2-thenoyltrifluoroacetone (TTA) was used as the second ligand. Furthermore, silica-modified SiO 2 @ANA-Si-Tb@SiO 2 , SiO 2 @ANA-Si-Tb-L@SiO 2 core–shell–shell nanostructured composites were also synthesized by sol–gel chemical route, which involved the hydrolysis and polycondensation processes of tetraethoxysilane (TEOS) using cetyltrimethyl ammonium bromide (CTAB) as a surface-active agent. An amorphous silica shell was coated around the SiO 2 @ANA-Si-Tb, SiO 2 @ANA-Si-Tb-L core–shell nanostructured composites. The core–shell and core–shell–shell nanostructured composites exhibited excellent luminescence in the solid state. Meanwhile, an improved luminescent stability property of the core–shell–shell nanostructured composites was observed for the aqueous solution. This type of core–shell–shell nanostructured composites exhibited bright luminescence, high stability and good solubility, which may present potential applications in the fields of optoelectronic devices, bio-imaging, medical diagnosis and study on the structure of function composite materials.

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Preparation and Characterization of ZrO2/CNTs by Hydrthermal Method

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.28 ◽

2011 ◽

Vol 335-336 ◽

pp. 28-31

Author(s):

Yu Ying Zheng ◽

Wen Jun Ji ◽

Jun Li ◽

Hui Min Huang ◽

Ming Sun

Keyword(s):

Zeta Potential ◽

Hydrothermal Method ◽

Surface Active Agent ◽

Active Agent ◽

Hydrothermal Time ◽

Hydrothermal Temperature ◽

Zeta Potentials ◽

Surface Active

Nano-compounds of ZrO2/CNTs were prepared by hydrothermal method. The ZrO2/CNTs nano-compounds were characterizated by XRD, TEM, BET and Zeta potentials. The results showed that perfect hydrothermal temperature was 180°C, hydrothermal time was 11h, pH was 9.5. It is showed by the analysis of TEM and Zeta potential, adding surfacant CTBA, the surface of nano-tube and Zr(OH)4colloids take different charge, and they adsorpt each other. And ZrO2particles were successfully coated on the CNTs in surface-active agent of CTBA.

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