Oxidation Resistive Cu Films by Room Temperature Surface Passivation with Thin Ag Layer

Oleylamine capped WS2 nanostructures were successfully formed at 320 °C via a relatively simple colloidal route. SEM and TEM analyses showed that the 3D nanoflowers that were initially formed disintegrated into 2D nanosheets after prolonged incubation. XPS and XRD analyses confirmed oxidation of WS2 into WO3. Sensors based on these oleylamine capped WS2 nanoflowers and nanosheets still showed a change in electrical response towards various concentrations of NH3 vapour at room temperature in a 25% relative humidity background despite the oxidation. The nanoflowers exhibited n-type response while the nanosheets displayed a p-type response towards NH3 exposure. The nanoflower based sensors showed better response to NH3 vapour exposure than the nanosheets. The sensors showed a good selectivity towards NH3 relative to acetone, ethanol, chloroform and toluene. Meanwhile, a strong interference of humidity to the NH3 response was displayed at high relative humidity levels. The results demonstrated that oleylamine limited the extent of oxidation of WS2 nanostructures. The superior sensing performance of the nanoflowers can be attributed to their hierarchical morphology which enhances the surface area and diffusion of the analyte.

Download Full-text

Room temperature surface-engineering enabling stability of high-energy-density lithium batteries

Materials Today Energy ◽

10.1016/j.mtener.2020.100415 ◽

2020 ◽

Vol 17 ◽

pp. 100415 ◽

Cited By ~ 1

Author(s):

C. Fang ◽

Y. Wang ◽

W. Liu ◽

R. Guo ◽

G. Dang ◽

...

Keyword(s):

Energy Density ◽

Lithium Batteries ◽

Room Temperature ◽

Surface Engineering ◽

High Energy ◽

High Energy Density ◽

Temperature Surface

Download Full-text

Low temperature surface passivation for silicon solar cells

Solar Energy Materials and Solar Cells ◽

10.1016/0927-0248(95)00155-7 ◽

1996 ◽

Vol 40 (4) ◽

pp. 297-345 ◽

Cited By ~ 117

Author(s):

C. Leguijt ◽

P. Lölgen ◽

J.A. Eikelboom ◽

A.W. Weeber ◽

F.M. Schuurmans ◽

...

Keyword(s):

Solar Cells ◽

Low Temperature ◽

Surface Passivation ◽

Silicon Solar Cells ◽

Temperature Surface

Download Full-text

The Fabrication of Mercuric Iodide Detectors for Use in Wavelength Dispersive X-Ray Analysers and Backscatter Photon Measurements

MRS Proceedings ◽

10.1557/proc-16-207 ◽

1982 ◽

Vol 16 ◽

Cited By ~ 10

Author(s):

John H. Howes ◽

John Watling

Keyword(s):

Room Temperature ◽

Gamma Ray ◽

Surface Passivation ◽

Electrical Contact ◽

Scintillation Counter ◽

Radiation Detectors ◽

Nuclear Radiation ◽

Gamma Ray Spectrometry ◽

Mercuric Iodide ◽

X Ray

ABSTRACTThis paper describes the fabrication of mercuric iodide nuclear radiation detectors suitable for X and gamma ray spectrometry at room temperature. The active area of the detectors studied are between 0.2 and 1.5cm sq and they are up to 0.5mm thick. The method of producing a stable electrical contact to the crystal using sputtered germanium has been studied. The X-ray resolution of a 1.5cm sq. area detector at 32 keV is 2.3 keV FWHM when operated at room temperature in conjunction with a time variant filter amplifier. A factor which is important in the fabrication of the detector is the surface passivation necessary to achieve a useful detector life.This type of detector has been used on a wavelength dispersive X-ray spectrometer for energy measurements between 10 and 100 keV. The advantages over the scintillation counter, more commonly used, is the improved resolution of the HgI2 detector and its smaller size. The analyser is primarily used for the detection of low levels of heavy metals on particulate filters. The detectors have also been used on an experimental basis for gamma ray backscatter measurements in the medical field.

Download Full-text