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RISS 인기검색어
- 검색키워드
- 저자 : Mohammad Vaseem (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Synthesis of ZnO nanoparticles and their ink-jetting behavior.
Vaseem, Mohammad,Lee, Kil-Mok,Shin, Jin-Koog,Hahn, Yoon-Bong American Scientific Publishers 2012 Journal of Nanoscience and Nanotechnology Vol.12 No.3
<P>Zinc oxide (ZnO) nanoparticles were synthesized by ultrasonically-assisted solution process without using any surfactants. The as-synthesized spherical ZnO nanoparticles with diameter of 20 +/- 5 nm possessed crystalline nature with wurtzite hexagonal phase and showed a blue-shifted near band-edge ultra-violet absorption at -340 nm due to quantum confinement effect of ZnO nanoparticles. The as-synthesized ZnO nanoparticles were further formulated as an ink for ink-jet printing application. Jetting and writing of various line patterns on Si and ITO substrates were demonstrated using the as-formulated ZnO ink. UV-treated substrates showed an improvement in the fixation of ink on substrate due to decreased contact angle with controlled surface wettability.</P>
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Inkjet Printed Fractal-Connected Electrodes with Silver Nanoparticle Ink
Vaseem, Mohammad,Lee, Kil Mok,Hong, A-Ra,Hahn, Yoon-Bong American Chemical Society 2012 ACS APPLIED MATERIALS & INTERFACES Vol.4 No.6
<P>The development of a simple and reliable method for nanoparticles-based ink in an aqueous solution is still a challenge for its inkjet printing application. Herein, we demonstrate the inkjet printing of fractal-aggregated silver (Ag) electrode lines on substrates. Spherical, monodisperse Ag nanoparticles have been synthesized using silver nitrate as a precursor, ethylene glycol as a reducing agent, and polyvinyl pyrrollidone as a capping agent. As-synthesized pure Ag nanoparticles were well dispersed in water-ethylene glycol mixture, which was directly used as an ink for inkjet printing. Using this ink, the Ag electrodes of fractal-connected lines were printed on Si/SiO<SUB>2</SUB>, glass, and polymer substrates. The fractal-connected Ag lines were attributed to the diffusion-limited aggregation of Ag nanoparticles and the effect of annealing on conductivity was also examined.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2012/aamick.2012.4.issue-6/am300689d/production/images/medium/am-2012-00689d_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am300689d'>ACS Electronic Supporting Info</A></P>
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Improved Optical Transparency of CuO Films Prepared by using Quantum-dot Ink on Glass Substrates
Rizwan Khan,Jin Hyeon Yun,이인환,Mohammad Vaseem,한윤봉 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.68 No.1
The present investigation reports a simple solution process for synthesizing CuO quantum dots at low temperature without using surfactants or templates. Detailed structural characterizations revealed that the as-prepared CuO quantum dots were uniform and dense with high crystallinity. As-prepared CuO quantum dots were used as an ink to prepare CuO films on glass substrates via a spin-coating method. The effects of annealing temperature on the optical properties of CuO films were investigated. The optical transparency of the CuO films showed an improved transmittance of > 80% at a wave length of 800 nm after annealing at 300 C. In addition, the band-gap energy was observed to decrease from 1.70 to 1.28 eV with increasing annealing temperature from 300 to 500 C due to the improvement in the crystallinity with grain growth in the films.
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Improved optical transparency of cuo films prepared by using quantum-dot ink on glass substrates
Khan, Rizwan,Yun, Jin Hyeon,Lee, In-Hwan,Vaseem, Mohammad,Hahn, Yoon Bong 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol. No.
<P>The present investigation reports a simple solution process for synthesizing CuO quantum dots at low temperature without using surfactants or templates. Detailed structural characterizations revealed that the as-prepared CuO quantum dots were uniform and dense with high crystallinity. As-prepared CuO quantum dots were used as an ink to prepare CuO films on glass substrates via a spin-coating method. The effects of annealing temperature on the optical properties of CuO films were investigated. The optical transparency of the CuO films showed an improved transmittance of > 80% at a wave length of 800 nm after annealing at 300 A degrees C. In addition, the band-gap energy was observed to decrease from 1.70 to 1.28 eV with increasing annealing temperature from 300 to 500 A degrees C due to the improvement in the crystallinity with grain growth in the films.</P>
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