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Zhang, Miluo,Kim, Jiwon,Kim, Seil,Park, Hosik,Jung, Hyunsung,Ndifor-Angwafor, N. George,Lim, Jaehong,Choa, Yongho,Myung, Nosang V. American Chemical Society 2014 Chemistry of materials Vol.26 No.8
<P>A cost-effective process that combines electrospinning and a galvanic displacement reaction was utilized to synthesize ultralong hollow Pb<SUB><I>x</I></SUB>Se<SUB><I>y</I></SUB>Ni<SUB><I>z</I></SUB> nanofibers with controlled dimensions, morphology, composition, and crystal structure. Ni nanofibers were electrospun with an average diameter of 150 nm and were used as the sacrificial material for the galvanic displacement reaction. The composition and morphology of the Pb<SUB><I>x</I></SUB>Se<SUB><I>y</I></SUB>Ni<SUB><I>z</I></SUB> nanofibers were controlled during the reaction by tuning the concentration of HSeO<SUB>2</SUB><SUP>+</SUP> in the electrolytes. Hollow Pb<SUB><I>x</I></SUB>Se<SUB><I>y</I></SUB>Ni<SUB><I>z</I></SUB> nanofibers with smooth surfaces were obtained from the low-concentration HSeO<SUB>2</SUB><SUP>+</SUP> solution (i.e., 0.01 and 0.05 mM), but the hollow nanofibers synthesized from the high-concentration HSeO<SUB>2</SUB><SUP>+</SUP> solution (i.e., 1 mM) have rough outer surfaces with nanocrystal protrusions. The Pb content of the nanofibers’ composition was varied from 3 to 42% by adjusting the HSeO<SUB>2</SUB><SUP>+</SUP> concentration. The thermoelectric properties of the nanofiber mats were characterized, and the highest Seebeck coefficient of approximately 449 μV/K at 300 K was found for the Pb<SUB>37</SUB>Se<SUB>59</SUB>Ni<SUB>4</SUB> nanofiber mat.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2014/cmatex.2014.26.issue-8/cm4041067/production/images/medium/cm-2013-041067_0012.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm4041067'>ACS Electronic Supporting Info</A></P>
I@?V characteristics of a vertical single Ni nanowire by voltage-applied atomic force microscopy
Choi, D.S.,Rheem, Y.,Yoo, B.,Myung, N.V.,Kim, Y.K. Elsevier 2010 CURRENT APPLIED PHYSICS Vol.10 No.4
We report the measurement of the electrical resistivity of a vertical single Ni nanowire. A vertical array of Ni nanowires was fabricated on a Si substrate by electrodeposition using a nanoporous alumina template. The Ni nanowires possessed a face-centered-cubic polycrystalline structure. A voltage-applied atomic force microscope was used to make a nanometer-scale point contact on top of the vertical grown single Ni nanowire. The measured resistance was 1.1MΩ for a nanowire with length of 3μm and diameter of 20nm.
I-V characteristics of a vertical single Ni nanowire by voltage-applied atomic force microscopy
D.S. Choi,유봉영,Y. Rheem,김영근,N.V. Myung 한국물리학회 2010 Current Applied Physics Vol.10 No.4
We report the measurement of the electrical resistivity of a vertical single Ni nanowire. A vertical array of Ni nanowires was fabricated on a Si substrate by electrodeposition using a nanoporous alumina template. The Ni nanowires possessed a face-centered-cubic polycrystalline structure. A voltage-applied atomic force microscope was used to make a nanometer-scale point contact on top of the vertical grown single Ni nanowire. The measured resistance was 1.1 MΩ for a nanowire with length of 3 ㎛ and diameter of 20 nm.
Chemical Ripening of AgBr Octahedral Microcrystals
Lee, Myung Cheon,Lim, Jong Choo,Lee, Euy Soo,Ahn, Hong C.,Zvidentsova, N. S.,Kolesnikov, L. V.,Kolesnikova, I. L. 한국공업화학회 2002 Journal of Industrial and Engineering Chemistry Vol.8 No.3
The results of the chemical sensitization study of octahedral AgBr microcrystals with the sizes 0.75 - 1.3 ㎛ in various modes of ripening are presented. Spontaneous sensitization (thermal ripening of emulsions without photographically active additives) has been investigated. The spontaneous sensitization is effected regardless of the type of gelatins during synthesis and chemical sensitization. The influence of both the pBr value of chemical ripening and the adsorption of stabilizers and gold ions on photographic characteristics of emulsions in modes of spontaneous and sulfur sensitization have been studied. The data obtained are compared with the results of the similar investigations carried out with the emulsions containing cubic microcrystals, as well as tabular microcrystals. The peculiarities of photosensitivity centre formation in AgBr (111) microcrystals are discussed in terms of ionic conductivity change during chemical ripening.