Strategy for Fabricating Wafer-Scale Platinum Disulfide.

PtS is a newly developed group 10 2D layered material with high carrier mobility, wide band gap tunability, strongly bound excitons, symmetrical metallic and magnetic edge states, and ambient stability, making it attractive in nanoelectronic, optoelectronic, and spintronic fields. To the aim of application, a large-scale synthesis is necessary. For transition-metal dichalcogenide (TMD) compounds, a thermally assisted conversion method has been widely used to fabricate wafer-scale thin films.

Photo-enhanced gas sensing of SnS with nanoscale defects.

Recently a SnS based NO gas sensor with a 30 ppb detection limit was demonstrated but this required high operation temperatures. Concurrently, SnS grown by chemical vapor deposition is known to naturally contain nanoscale defects, which could be exploited. Here, we significantly enhance the performance of a NO gas sensor based on SnS with nanoscale defects by photon illumination, and a detection limit of 2.

Temperature-Dependent Photoluminescence Emission from Unstrained and Strained GaSe Nanosheets.

Two-dimensional AB layered semiconductors have recently attracted great attention due to their potential applications in piezo-phototronics and optoelectronics. Here, we report the temperature-dependent photoluminescence (PL) of strained and unstrained GaSe flakes. It is found that, as the temperature increases, the PL from both the strained (wrinkled) and unstrained (flat) positions show a prominent red-shift to low energies.

[Simultaneous determination of multi-organotin compounds in seawater by liquid-liquid extraction-high performance liquid chromatography-inductively coupled plasma mass spectrometry].

The hyphenated technique of high performance liquid chromatography coupled with inductively coupled plasma mass spectrometry (HPLC-ICP-MS) was applied to the simultaneous determination of five organotin compounds (trimethyltin, dibutyltin, tributyltin, diphenyltin and triphenyltin) in seawater samples. Agilent TC-C18 column was used for the separation, the mobile phase of HPLC was CH3CN : H2O : CH3COOH = 65 : 23 : 12 (phi3), 0.05% TEA, and pH value was adjusted to 3.

[ICP-MS with octopole reaction system applied to isotopic analysis of iron in human fecal samples].

Objective: The study was aimed to evaluate the application of the quadrupole inductively coupled plasma mass spectrometer (ICP-MS) with collision/reaction cell octopole reaction system (ORS) to determine the iron stable isotope ratio in human fecal samples.

Methods: In a field trial on human metabolism, 3.0 mg per subject of iron with 57Fe enriched was orally administrated, and feces were collected by fecal monitoring.

[Determination of As and Se in animal and plant samples by the normal ICP-MS with and without octupole reaction system and the ICP-MS with ORS].

Scme certified reference materials (CRMs) were digested and the elemental concentrations were determined by ICP-MS instrument, and the results include not only the trace key elements such as As, Pb, Hg and Cd but also the major components such as Ca, Fe, K, Na etc. The digestion method, the recoveries, and the detection limits are discussed to piove the reliability of ICP-MS and EPA200.8 method for the determination of the elements in fcxxl and plant samples.

Determination of trace-level haloacetic acids in drinking water by ion chromatography-inductively coupled plasma mass spectrometry.

A new method for the determination of nine haloacetic acids (HAAs) with ion chromatography (IC) coupled to inductively coupled plasma mass spectrometry (ICP-MS) was developed. With the very hydrophilic anion-exchange column and steep gradient of sodium hydroxide, the nine HAAs could be well separated in 15 min. After suppression with an ASRS suppressor that was introduced in between IC and ICP-MS, the background was much decreased, the interference caused by sodium ion present in eluent was removed, and the sensitivities of HAAs were greatly improved.

Transfer of metals from soil to vegetables in an area near a smelter in Nanning, China.

A field survey was conducted to investigate the metal contamination in soils and vegetables, and to evaluate the possible health risks to local population through foodchain transfer near a smelter in Nanning, southern China. Contamination levels in soils and vegetables with cadmium (Cd), lead (Pb), zinc (Zn) and copper (Cu) were measured, and transfer factors (TF) from soils to vegetable plants and its health risk (risk index, RI) were calculated accordingly. Results showed that both soils and vegetables from villages 1 and 2 (V1 and V2, 1500 m and 500 m from the smelter) were heavily contaminated, compared to a village 50 km from the smelter.