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Effect of hydrogen gas on the growth process of PbS nanorods grown by a CVD method
Ramin Yousefi,Mohsen Cheraghizade,Farid Jamali-Sheini,Wan Jefrey Basirun,Nay Ming Huang 한국물리학회 2014 Current Applied Physics Vol.14 No.8
PbS nanostructures were grown by sulfuration of two lead sheets in a tube furnace under nitrogen (N2) and argon/hydrogen (Ar/H2) conditions. All conditions, such as the sheet temperature, sulfur powder temperature, and the carrier gas rate, were the same for two samples. Field emission scanning electron microscope (FESEM) images showed that the nanostructures with rod morphology were formed on the sheets. However, the nanorods that were grown under N2 gas, were denser, more compact, and a different shape and size in comparison to another sample. In addition, the nanorods grown under N2 gas exhibited a rectangular shape, while another sample showed nanorods that were tapered. X-ray diffraction (XRD) patterns indicated that these nanorods were PbS with a cubic phase. Furthermore, Raman measurements confirmed the XRD results, and indicated three Raman active modes of PbS phase. The optical characterization results showed a band gap for the PbS nanorods in the infrared region.
Mat Teridi, Mohd Asri,Sookhakian, Mehran,Basirun, Wan Jefrey,Zakaria, R.,Schneider, Fabio Kurt,da Silva, Wilson Jose,Kim, Jaeyeon,Lee, Seung Joo,Kim, Hyeong Pil,Mohd Yusoff, Abd. Rashid bin,Jang, Jin The Royal Society of Chemistry 2015 Nanoscale Vol.7 No.16
<▼1><▼1><P>High performance organic devices were successfully demonstrated with the presence of highly ordered nanoimprinted Au nanodisks.</P></▼1><▼2><P>High performance organic devices including polymer solar cells (PSCs) and light emitting diodes (PLEDs) were successfully demonstrated with the presence of highly ordered nanoimprinted Au nanodisks (Au NDs) in their solution-processed active/emissive layers, respectively. PSCs and PLEDs were fabricated using a low bandgap polymer and acceptor, nitrogen doped multiwalled carbon nanotubes poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-<I>b</I>]-thiophenediyl] (n-MWCNTs:PTB7), and [6,6]-phenyl C71 butyric acid methyl ester (PC71BM) and (4,4-<I>N</I>,<I>N</I>-dicarbazole) biphenyl (CBP) doped with tris(2-phenylpyridine) iridium(iii) (Ir(ppy)3) as active/emissive layers, respectively. We synthesized nitrogen doped graphene and used it as anodic buffer layer in both devices. The localized surface plasmon resonance (LSPR) effect from Au NDs clearly contributed to the increase in light absorption/emission in the active layers from electromagnetic field enhancement, which originated from the excited LSPR in PSCs and PLEDs. In addition to the high density of LSPR and strong exciton-SP coupling, the electroluminescent (EL) enhancement is ascribed to enhanced spontaneous emission rates. This is due to the plasmonic near-field effect induced by Au NDs. The PSCs and PLEDs exhibited 14.98% (8.08% to 9.29%) under one sun of simulated air mass 1.5 global (AM1.5G) illumination (100 mW cm<SUP>−2</SUP>) and 19.18% (8.24 to 9.82 lm W<SUP>−1</SUP>) enhancement in the power conversion efficiencies (PCEs) compared to the control devices without Au NDs.</P></▼2></▼1>
Crystallization behavior of tantalum and chlorine co-substituted hydroxyapatite nanopowders
Bahman Nasiri-Tabrizi,Belinda Pingguan-Murphy,Wan Jefrey Basirun,Saeid Baradaran 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.33 No.-
The crystallization behavior of tantalum and chlorine co-substituted hydroxyapatite nanopowders wasexamined. Results showed that combined processing by mechanical alloying and annealing is conduciveto the structural changes and crystal growth. A series of nanocrystalline tantalum and chlorine cosubstitutedhydroxyapatite (Ta/Cl–HA) with different dopant contents were synthesized as a result ofthe progressive mechanochemical reaction. During the subsequent annealing, crystallization of the asmilledpowders occurred, leading to a significant increase in the fraction of crystalline phase. TEMimages revealed that the crystallized and doped nanopowders composed of crystalline nanoneedles withan average size of 61 26 nm.