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학술지 Air-Stable, Nanostructured Electronic and Plasmonic Materials from Solution-Processable, Silver Nanocrystal Building Blocks
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저자
Aaron T. Fafarman, 홍성훈, 오승주, Humeyra Caglayan, Xingchen Ye, Benjamin T. Diroll, Nader Engheta, Christopher B. Murray, Cherie R. Kagan
발행일
201403
출처
ACS Nano, v.8 no.3, pp.2746-2754
ISSN
1936-0851
출판사
American Chemical Society (ACS)
DOI
https://dx.doi.org/10.1021/nn406461p
초록
Herein we describe a room-temperature, chemical process to transform silver nanocrystal solids, deposited from colloidal solutions, into highly conductive, corrosion-resistant, optical and electronic materials with nanometer-scale architectures. After assembling the nanocrystal solids, we treated them with a set of simple, compact, organic and inorganic reagents: ammonium thiocyanate, ammonium chloride, potassium hydrogen sulfide, and ethanedithiol. We find that each reagent induces unique changes in the structure and composition of the resulting solid, giving rise to films that vary from insulating to, in the case of thiocyanate, conducting with a remarkably low resistivity of 8.8 × 10-6 쨌cm, only 6 times that of bulk silver. We show that thiocyanate mediates the spontaneous sintering of nanocrystals into structures with a roughness of less than 1/10th of the wavelength of visible light. We demonstrate that these solution-processed, low-resistivity, optically smooth films can be patterned, using imprint lithography, into conductive electrodes and plasmonic mesostructures with programmable resonances. We observe that thiocyanate-treated solids exhibit significantly retarded atmospheric corrosion, a feature that dramatically increases the feasibility of employing silver for electrical and plasmonic applications. © 2014 American Chemical Society.
키워드
ammonium thiocyanate, conductivity, dielectric function, electrodes, ligand exchange, metamaterials, nanoimprinting, printing, silver nanoparticles, soft lithography
KSP 제안 키워드
Ammonium chloride, Ammonium thiocyanate, Building block, Chemical Process, Colloidal solution, Corrosion-resistant, Nanocrystal solids, Nanometer-scale, Organic-inorganic, Plasmonic materials, Room-temperature