ORCID Profile
0000-0002-0403-8351
Current Organisation
University of Alberta
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Publisher: Elsevier BV
Date: 03-2008
Publisher: Elsevier BV
Date: 02-2007
Publisher: Elsevier BV
Date: 04-2007
Publisher: Elsevier BV
Date: 2005
Publisher: Wiley
Date: 29-05-2022
Abstract: Molybdenum disulfide nanosheets (MoS 2 NSs) are synthesized via pulsed laser ablation of MoS 2 target in liquid nitrogen (LN 2 ) using the Q‐switched Nd:YAG (Nd:Y 3 Al 5 O 12 ) laser. Not only LN 2 facilitates the condensation of the laser‐induced plasma plume to produce MoS 2 NSs alongside main by‐products (namely, MoS 2 quantum dots (QDs)), but also provides an optimum condition for nitrogen‐doped MoS 2 (N‐MoS 2 ) synthesis as a p‐type semiconductor. The structural, optical, and chemical properties of NSs are investigated using various electron microscopic instruments and spectrometers. These attest to the formation of suspension MoS 2 NSs with a few‐layer structure and rather large lateral size. MoS 2 NSs enjoy extra chemical components such as Mo–N bonding. Furthermore, photoluminescence (PL) spectroscopy reveals exciton and trion peaks as the evidence of p‐type property. Subsequently, the Hall effect verifies the p‐type property of N‐MoS 2 NSs. By making use of the spin coating, the N‐MoS 2 diaphragm has been fabricated then, it is mounted on the Fabry–Pérot interferometer (FPI) assembly using the fishing method. Thus, N‐MoS 2 in FPI acts as a sensitive component of the acoustic optical fiber sensor. The diaphragm operates as ultrasensitive membrane to detect acoustic waves enhancing the sensitivity up to 20% mainly due to the smaller Young's modulus.
Publisher: Elsevier BV
Date: 12-2007
Publisher: Wiley
Date: 30-03-2010
DOI: 10.1002/APP.31180
Publisher: Elsevier BV
Date: 11-2008
Publisher: Elsevier BV
Date: 2009
Publisher: Wiley
Date: 19-07-2011
DOI: 10.1002/PAT.2022
Publisher: Elsevier
Date: 2018
Publisher: Wiley
Date: 15-04-2011
DOI: 10.1002/PAT.1551
Publisher: Elsevier BV
Date: 09-2010
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 2010
Publisher: Elsevier BV
Date: 09-2004
Publisher: Elsevier BV
Date: 15-07-2008
Publisher: Elsevier BV
Date: 10-2008
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 11-2006
Publisher: Elsevier BV
Date: 02-2007
Publisher: Elsevier BV
Date: 11-2009
Publisher: Elsevier BV
Date: 08-2004
Publisher: Elsevier
Date: 2020
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.SCITOTENV.2019.134951
Abstract: The major problem that limits the utilization of PES membranes in treatment of oily wastewater is the drastic irreversible membrane fouling due to the attachment of oil droplets onto the membrane surface. The goal of this study was to develop a novel, fast and facile post-functionalization of polydopamine (PDA) coated membranes using pre-synthesized nanoparticles for fabrication of novel organic-inorganic hybrid recoverable membranes with high hydrophilicity and underwater oleophobicity. Here, bio-inspired technique was studied because the membrane technology could separate small oil droplets (even <10 µm) with high performance if faced little fouling phenomena during the treatment process. The amino-functionalized multi-wall carbon nanotubes (N-MWCNTs) were anchored onto the PDA coated PES membranes. The membranes characteristics, with specific focus on surface morphology and wettability were investigated. The newly developed PES/PDA/N-MWCNTs membranes showed an enhanced flux (~1086%) compared to the unmodified PES membrane. This enhancement was attributed to the high hydrophilic and underwater oleophobic properties, which were found to alleviate the effect of fouling. The total fouling ratio (R
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 07-2019
Publisher: Elsevier BV
Date: 03-2011
Publisher: Elsevier BV
Date: 05-2013
Publisher: MDPI AG
Date: 31-12-2022
DOI: 10.3390/EN16010455
Abstract: Here, nitrogen doped molybdenum disulfide quantum dots (N-MoS2 QDs) are fabricated by making use of the pulsed laser ablation (PLA) process in liquid nitrogen (LN2) as a dopant agent. In fact, LN2 contributes the rapid condensation of the plasma plume to form MoS2 QDs, optimizing the conditions for the synthesis of N-doped MoS2 with p-type property. The structural/optical features of the synthesized products are studied using transmission electron microscopy (TEM), absorption spectroscopy, photoluminescence (PL) spectroscopy techniques, and X-ray photoelectron spectroscopy (XPS). The TEM image shows the creation of MoS2 QDs with 5.5 nm average size. UV-vis and PL spectroscopy confirm the formation of N-MoS2 QDs according to the dominant peaks. The Tuck plot gives a direct band-gap of 4.34 eV for MoS2 QDs. Furthermore, XPS spectroscopy reveals Mo-N bonding, indicating nitrogen doping as evidence of p-type MoS2 QDs. Thus, PLA provides a single-stage way to the clean and green synthesis of the MoS2 QDs suspension without a need for high vacuum devices and additional chemical components. Regarding the pristine MoS2, the N-MoS2 QDs benefit from a low overpotential of −0.35 V at −10 mA/cm2 per µg alongside a low Tafel slope of 300 mV/dec. Subsequently, the lower Rct value of N-MoS2 QDs verifies the enhancement of the charge transfer kinetics mainly due to the elevated electronic conductivity. Furthermore, the quasi-rectangular cyclic voltammetry (CV) as well as the larger current window demonstrate a notable electrocatalytic activity. The former is based on the enhanced active sites in favor of N-MoS2 QDs against other s les of interest. Thereby, it is discovered that the N-doped MoS2 QD acts as an effective catalyst to notably improve the performance of the hydrogen evolution reaction (HER).
Publisher: Springer International Publishing
Date: 2017
Publisher: Elsevier BV
Date: 10-2009
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier
Date: 2018
Publisher: Elsevier BV
Date: 10-2009
Publisher: Elsevier BV
Date: 11-2005
Publisher: Springer Science and Business Media LLC
Date: 09-07-2009
Publisher: Elsevier BV
Date: 11-2009
Publisher: Informa UK Limited
Date: 05-03-2010
Publisher: Elsevier BV
Date: 11-2019
Publisher: Informa UK Limited
Date: 06-2012
Location: Iran (Islamic Republic of)
No related grants have been discovered for Mohtada Sadrzadeh.