Shanhu Liu

Synthesis of CdSe and CdSe/TiO2 nanoparticles under multibubble sonoluminescence condition

CdSe and CdSe/TiO(2) nanoparticles were synthesized under multibubble sonoluminescence (MBSL) condition. The influences of TiO(2) introduced as the sensitizer on the morphology and crystal transformation were investigated. The morphology, phase and optical properties of the final products have been characterized by X-ray powder diffraction, transmission electron microscope, UV-vis absorption spectroscopy and photoluminescence spectroscopy. The results showed that as-prepared nanoparticles are well-crystallized, and the suppression of crystal pattern transition as well as the control of CdSe crystal growth can be implemented by coupling of TiO(2) semiconductor. Furthermore, the possible growth mechanism for different morphologies and crystal phases of the nanocrystals were also discussed.

Low Cost and Reliable Electrochemical Sensor for Rutin Detection Based on Au Nanoparticles-Loaded ZnS Nanocomposites

Facile preparation of electrode modified materials with low-cost nanocomposites is an important step to develop highly active electrochemical sensors for mass-market applications. Here we fabricated Au nanoparticles (AuNPs)-loaded ZnS nanocomposites for the sensitive determination of rutin due to the cooperative amplification of the conductivity and catalytic activity of AuNPs on ZnS spheres resulting from the high loading ratio of AuNPs on ZnS spheres. Under the optimal conditions, the developed sensor based on AuNPs-loaded ZnS nanocomposites exhibited excellent electrocatalytic activity towards rutin in a linear range from 1 × 10-7 mol/L to 2 × 10-5 mol/L with a limit of detection of 15.3 nM at a signal-to-noise ratio of 3. Furthermore, the proposed method gave satisfactory results for rutin determination in pharmaceutical tablets, which offer promising potential for rutin electrochemical analysis in serum monitoring or Chinese medical analysis owing to its simplicity, low cost, high sensitivity and good stability.

Sensitive Detection of Rifampicin Based on Au-Carbon Nanocomposite

Gold nanoparticles-supported Cabot Vulcan XC72R (Au/VXC72R) nanocomposite was synthesized by chemical reduction of gold (III) chloride with VXC72R. A novel electrochemical sensor based on the Au/VXC72R nanocomposite has been fabricated for the sensitive detection of rifampicin (RIF). Field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray powder diffractometer (XRD) and X-ray photoelectron spectroscopy (XPS) were used to characterize the morphology, structure and compositions of the nanocomposite. Under the optimal conditions, the Au/VXC72R-chitosan/GCE can be used to determine RIF concentration in a linear range from 5 × 10-7 mol/L to 1 × 10-5 mol/L with the detection limit of 1.1 × 107 M (S/N = 3). The proposed approach exhibits good stability, acceptable reproducibility and applicability, which will probably bring widespread applications in quality monitoring in real samples.

CdS/ZnS Heterostructured Porous Composite with Enhanced Visible Light Photocatalysis

Fabrication of semiconductor composites consisting of multicomponent or multiphase heterojunctions is a very effective strategy to design highly active photocatalyst systems. Here we present a facile design to fabricate novel CdS/ZnS heterostructured porous sheet-like nanocomposite based on a cation-exchanged hydrothermal procedure. Micro-structural analyses reveal that the product is a kind of heterostructured composite with porous structure and high crystallinity. The composite nanosheets exhibited enhanced visible-light photoactivity compared with pure ZnS or CdS. Among them, sample of Cd0.45Zn0.55S gave the highest degradation rate of about 99% under visible-light irradiation within 60 min when 10 mg of the sample was added into 50 mL of methyl orange in aqueous solution (10 mg/L). The enhanced photocatalytic activity was presumed to result from the direct photoinduced interfacial charge transfer (IFCT) from the valence band (VB) of ZnS to CdS.

Sensitive Determination of Dopamine and Paracetamol Based on Carbon Nanotubes-Supported Pd Nanoparticles

A novel chemically modified electrode was constructed in this study based on the carbon nanotubes-supported Pd nanoparticles (Pd/CNTs). It was demonstrated that the sensor could be used for the determination of dopamine (DA) and paracetamol (PA). The measurements were carried out through application of cyclic voltammetry (CV), differential pulse voltammetry (DPV) and amperometric i-t curve. Under optimum conditions and using the amperometric i-t curve method, the modified electrode provided linear response versus dopamine concentrations in the range of 0.3 × 10-6-5.0 × 10-5 M and PA concentrations in the range of 0.2 × 10-6-6.0 × 10-5 M, respectively. The detection limits for the DA and PA were 9.1 × 10-8 M and 8.9 × 10-8 M (S/N = 3), respectively. The sensitivities for of the electrode were 0.928 and 1.532 μA μM-1 cm-1, respectively.

ODS – modified TiO2 nanoparticles for the preparation of self-cleaning superhydrophobic coating

Rolling water drops takes off dust particles from lotus leaf showing self-cleaning performance. Self-cleaning effect has great importance in industry as well as in daily life. The present paper describes the preparation of self-cleaning superhydrophobic coating through simple and low cost dip coating technique. The prepared superhydrophobic surface enact as lotus leaf. Firstly TiO2 nanoparticles were dispersed in ethanol and different concentration of octadecyltrichlorosilane (ODS) was added in TiO2 dispersion. The effect of number of deposition layer on the wettability of the coating was studied. The coating prepared from five deposition layers showed contact angle higher than 150° and sliding angle less than 10°. The superhydrophobicity increases with increasing concentration of ODS. The hierarchical rough morphology which is preferable for superhydrophobicity was obtained. The prepared coatings were stable against water jet impact and showed repellent towards colored and muddy water. Such superhydrophobic coating can find enormous scope in self-cleaning application.Rolling water drops takes off dust particles from lotus leaf showing self-cleaning performance. Self-cleaning effect has great importance in industry as well as in daily life. The present paper describes the preparation of self-cleaning superhydrophobic coating through simple and low cost dip coating technique. The prepared superhydrophobic surface enact as lotus leaf. Firstly TiO2 nanoparticles were dispersed in ethanol and different concentration of octadecyltrichlorosilane (ODS) was added in TiO2 dispersion. The effect of number of deposition layer on the wettability of the coating was studied. The coating prepared from five deposition layers showed contact angle higher than 150° and sliding angle less than 10°. The superhydrophobicity increases with increasing concentration of ODS. The hierarchical rough morphology which is preferable for superhydrophobicity was obtained. The prepared coatings were stable against water jet impact and showed repellent towards colored and muddy water. Such superhydropho...

Synthesis of CdTe/TiO{sub 2} nanoparticles and their photocatalytic activity

Abstract Visible-light-induced CdTe/TiO 2 photocatalysts were synthesized under multibubble sonoluminescence (MBSL) condition. The morphology, phase and optical properties of the products have been characterized by X-ray powder diffraction, field emission scan electron microscope, UV–vis absorption spectroscopy and photoluminescence spectroscopy. The results showed that as-prepared nanoparticles are well-crystallized with a better size distribution. In addition, the photocatalytic activities of products were evaluated using the photocatalytic degradation of rhodamine B as a probe reaction. The results showed that the products synthesized under MBSL condition exhibited higher photocatalytic activities than those without MBSL irradiation.