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Electrospun uniaxially-aligned composite nanofibers as highly-efficient piezoelectric material
Lee, Caroline,Wood, David,Edmondson, Dennis,Yao, Dingyu,Erickson, Ariane E.,Tsao, Ching Ting,Revia, Richard A.,Kim, Hyungsub,Zhang, Miqin Elsevier Science B.V., Amsterdam. 2016 CERAMICS INTERNATIONAL Vol.42 No.-
Choi, Inhee,Huh, Yun Suk,Erickson, David Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.4
<P>Trace detection and physicochemical characterization of protein aggregates have a large impact in understanding and diagnosing many diseases, such as ageing-related neurodegeneration and systemic amyloidosis, for which the formation of protein aggregates is one of the pathological hallmarks. Here we demonstrate an innovative label-free method for detecting and characterizing small amounts of early stage protein aggregates using a Raman active nanofluidic device. Sub-micrometre channels formed by a novel elastomeric collapse technique enable the separation and concentration of matured protein aggregates from small protein molecules. The Raman enhancement by gold nanoparticle clusters fixed below a micro/nanofluidic junction allows characterization of intrinsic properties of protein aggregates at concentration levels (∼fM) much lower than can be done with traditional analytical tools. With our device we show for the first time the concentration dependence of protein aggregation over these low concentration ranges. We expect that our method could facilitate definitive diagnosis and possible therapeutics of diseases at early stages.</P> <P>Graphic Abstract</P><P>We demonstrate an innovative label-free method for detecting and characterizing trace amounts of early stage protein aggregates. Nanofluidic channels formed by a novel elastomeric collapse technique enable the separation and concentration of matured protein aggregates. The Raman enhancement by gold nanoparticle clusters fixed below a micro/nanofluidic junction allows for characterizing intrinsic properties of protein aggregates. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0lc00383b'> </P>
Large area flexible SERS active substrates using engineered nanostructures
Chung, Aram J.,Huh, Yun Suk,Erickson, David Royal Society of Chemistry 2011 Nanoscale Vol.3 No.7
<P>Surface enhanced Raman scattering (SERS) is an analytical sensing method that provides label-free detection, molecularly specific information, and extremely high sensitivity. The Raman enhancement that makes this method attractive is mainly attributed to the local amplification of the incident electromagnetic field that occurs when a surface plasmon mode is excited at a metallic nanostructure. Here, we present a simple, cost effective method for creating flexible, large area SERS-active substrates using a new technique we call shadow mask assisted evaporation (SMAE). The advantage of large, flexible SERS substrates such as these is they have more area for multiplexing and can be incorporated into irregular surfaces such as clothing. We demonstrate the formation of four different types of nanostructure arrays (pillar, nib, ellipsoidal cylinder, and triangular tip) by controlling the evaporation angle, substrate rotation, and deposition rate of metals onto anodized alumina nanoporous membranes as large as 27 mm. In addition, we present experimental results showing how a hybrid structure comprising of gold nanospheres embedded in a silver nano-pillar structure can be used to obtain a 50× SERS enhancement over the raw nanoparticles themselves.</P> <P>Graphic Abstract</P><P>A simple, cost effective method for creating flexible, large area SERS-active substrates using a new technique is presented, which we refer to as shadow mask assisted evaporation (SMAE). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1nr10265f'> </P>
Choi, Bong Gill,Huh, Yun Suk,Hong, Won Hi,Erickson, David,Park, Ho Seok RSC Pub 2013 Nanoscale Vol.5 No.9
<P>Hierarchical structures of hybrid materials with the controlled compositions have been shown to offer a breakthrough for energy storage and conversion. Here, we report the integrative assembly of chemically modified graphene (CMG) building blocks into hierarchical complex structures with the hybrid composition for high performance flexible pseudocapacitors. The formation mechanism of hierarchical CMG/Nafion/RuO2 (CMGNR) microspheres, which is triggered by the cooperative interplay during the in situ synthesis of RuO2 nanoparticles (NPs), was extensively investigated. In particular, the hierarchical CMGNR microspheres consisting of the aggregates of CMG/Nafion (CMGN) nanosheets and RuO2 NPs provided large surface area and facile ion accessibility to storage sites, while the interconnected nanosheets offered continuous electron pathways and mechanical integrity. The synergistic effect of CMGNR hybrids on the supercapacitor (SC) performance was derived from the hybrid composition of pseudocapacitive RuO2 NPs with the conductive CMGNs as well as from structural features. Consequently, the CMGNR-SCs showed a specific capacitance as high as 160 F g(-1), three-fold higher than that of conventional graphene SCs, and a capacitance retention of >95% of the maximum value even after severe bending and 1000 charge-discharge tests due to the structural and compositional features.</P>