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transmittance-electron-microscopy
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Physical analysis of silver thin films deposited by electron beam technique
, Article Protection of Metals and Physical Chemistry of Surfaces ; Volume 56, Issue 2 , 2020 , Pages 295-301 ; Samavat, F ; Amini, J ; Sharif University of Technology
Pleiades Publishing
2020
Abstract
Abstract: The effect of annealing temperature on the properties of silver thin films has been investigated. Ag thin films have been deposited on glass substrates by electron beam coating, afterward subjected to annealing in a mixed ambient of air and oxygen at 100, 200, 300, 400 and 500°C for 3 h and then cooled slowly. The crystallographic structures of the Ag thin films were studied as a function of the annealing temperature. X‑ray diffraction (XRD) was used to estimate the crystallographic texture and grain size. All the films were found to have crystalline structure. The film microstructures were studied by scanning electron microscopy (SEM). The XRD and SEM results confirmed the...
Investigating the shape evolution mechanism of CdSe quantum dots by chemometrics analysis of spectrophotometry data
, Article Journal of Physical Chemistry C ; Volume 112, Issue 47 , 2008 , Pages 18321-18324 ; 19327447 (ISSN) ; Hormozi Nezhad, M. R ; Sharif University of Technology
2008
Abstract
The study on the mechanism of the shape evolution of nanocrystaline particles is an important and emerging field, which is applicable in the shaped control synthesis of nanoparticles. As an alternative to transmittance electron microscopy (TEM), which is already used in the study of nanoparticles, in this article a simple spectrophotometric method has been proposed utilizing the advantages of chemometrics methods in analyzing overlapped and complex spectral data. The evolutionary visible absorbance data of CdSe quantum dots through particle formation were analyzed by factor analysis, evolving factor analysis, and multivariate curve resolution-alternative least-squares analysis, by which four...
In situ two-step preparation of 3D NiCo-BTC MOFs on a glassy carbon electrode and a graphitic screen printed electrode as nonenzymatic glucose-sensing platforms
, Article ACS Sustainable Chemistry and Engineering ; Volume 8, Issue 38 , 2020 , Pages 14340-14352 ; Shahrokhian, S ; Hosseini, H ; Sharif University of Technology
American Chemical Society
2020
Abstract
In the present study, a rational two-step strategy is employed for the green, fast, very simple, and highly controllable synthesis of the bimetallic nickel-cobalt-based metal-organic frameworks (MOFs) on glassy carbon substrates by in situ transformation of nickel-cobalt-layered double hydroxide nanosheet (NiCo-LDHs NSs) intermediates into nickel-cobalt-benzene tricarboxylic acid MOFs (E-NiCo-BTC MOFs). The structural characteristics of the electrode materials in each step were investigated via Fourier transform infrared spectroscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, elemental mapping, field emission scanning electron microscopy, and transmittance electron microscopy....