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RISS 인기검색어
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- 저자 : Nadia Akram (검색결과 2 건)
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Saqib Ali,Sofia Javed,Muhammad Aftab Akram,Nadia Shahzad,Muhammad Adnan,Muhammad Usman,Maryam Basit,Faiza Rizwan,Muhammad Mujahid 한국전기전자재료학회 2024 Transactions on Electrical and Electronic Material Vol.25 No.4
In this study, the optoelectronic characteristics of cesium-based all-inorganic perovskite (AIP) nanocrystals (NCs) are examined in relation to Sr/Ni doping. These nanocrystals are synthesized via the hot injection method and then examined for compositional, morphological, optical, and electrical characteristics. Scanning electron microscopy reveals the homogeneous and compact NCs clusters while Atomic Force Microscopy (AFM) studies shows smooth film morphology with a narrow size distribution. X-ray diffraction analysis confirmed the monoclinic perovskite structure and excellent crystallinity. Similarly, Fourier-transform infrared spectroscopy has shown evidence for the existence of long-chain organic ligands employed for the stability and passivation of the NCs. High absorbance in the visible region is seen by UV–Visible spectroscopy, with a band gap of 2.44-2.48 eV while steady-state photoluminescence spectroscopy indicates low lattice defects and high crystallinity. Doping with Sr/Ni increased the bulk charge carrier concentration up to 3.70 × 10 16 cm -3 and decreased the resistivity to 4.61 × 10 3 Ω cm as compared to 1.45 × 10 13 cm -3 and 8.58 × 10 3 Ω cm respectively according to measurements made using the hall effect measurments. The doped AIP NCs displayed excellent thermal stability up to 545 °C. The Ni/Sr doping has resulted in obtaining improved properties in CsPbBr 3 perovskite NCs for optoelectronic application.
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Performance Behavior of Chitosan Based Water Dispersible Polyurethanes: Physicochemical Properties
Noureen Arshad,Khalid Mahmood Zia,Farukh Jabeen,Muhammad Naveed Anjum,Nadia Akram,Muhammad Kaleem Khosa 한국섬유공학회 2018 Fibers and polymers Vol.19 No.11
The research work was carried out to synthesize a series of novel chitosan based water dispersible polyurethanes (CS-WDPUs). The three step synthesis involves the formation of end capped PU-prepolymer was formed through the reaction between polyethylene glycol (PEG) (Mn=600 g/mole, dimethylolpropionic acid (DMPA) and isophorone diisocyanate (IPDI) followed by the preparation of neutralized NCO terminated PU-prepolymer, which lead to the chain extension by using the chitosan. The dispersion of the obtained product was carried out by adding proper proportion of water. The synthesized CS-WDPUs were applied onto the different qualities of plain weave poly-cotton printed and dyed textile swatches by employing pad-dry-cure procedures. The textile assets of the treated and untreated textile swatches were assessed, as color fastness, pilling resistance, tear and tensile strength. The results showed that the chitosan incorporation into PU backbone has significant effect on the assets of treated textiles. These synthesized CS-WDPUs are eco-friendly bio-based finishes with potential applications for polyester/cotton textiles.
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