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Choi, Sun,Jamshidi, Arash,Seok, Tae Joon,Wu, Ming C.,Zohdi, Tarek I.,Pisano, Albert P. American ChemicalSociety 2012 Langmuir Vol.28 No.6
<P>We report a fast, high-throughput method to create size-tunablemicro/nanoparticle clusters via evaporative assembly in picoliter-scaledroplets of particle suspension. Mediated by gravity force and surfacetension force of a contacting surface, picoliter-scale droplets ofthe suspension are generated from a nanofabricated printing head.Rapid evaporative self-assembly of the particles on a hydrophobicsurface leads to fast clustering of micro/nanoparticles and formsparticle clusters of tunable sizes and controlled spacing. The evaporatingbehavior of the droplet is observed in real-time, and the clusteringcharacteristics of the particles are understood based on the physicsof evaporative-assembly. With this method, multiplex printing of variousparticle clusters with accurate positioning and alignment are demonstrated.Also, size-unifomity of the cluster arrays is thoroughly analyzedby examining the metallic nanoparticle cluster-arrays based on surface-enhancedRaman spectroscopy (SERS).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2012/langd5.2012.28.issue-6/la204362s/production/images/medium/la-2011-04362s_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la204362s'>ACS Electronic Supporting Info</A></P>
Takahashi, Toshitake,Nichols, Patricia,Takei, Kuniharu,Ford, Alexandra C,Jamshidi, Arash,Wu, Ming C,Ning, C Z,Javey, Ali IOP Pub 2012 Nanotechnology Vol.23 No.4
<P>Spatially composition-graded CdS<SUB>x</SUB>Se<SUB>1−x</SUB> (x = 0–1) nanowires are grown and transferred as parallel arrays onto Si/SiO<SUB>2</SUB> substrates by a one-step, directional contact printing process. Upon subsequent device fabrication, an array of tunable-wavelength photodetectors is demonstrated. From the spectral photoconductivity measurements, the cutoff wavelength for the device array, as determined by the bandgap, is shown to cover a significant portion of the visible spectrum. The ability to transfer a collection of crystalline semiconductor nanowires while preserving the spatially graded composition may enable a wide range of applications, such as tunable lasers and photodetectors, efficient photovoltaics, and multiplexed chemical sensors.</P>
Roll-to-Roll Anodization and Etching of Aluminum Foils for High-Throughput Surface Nanotexturing
Lee, Min Hyung,Lim, Namsoo,Ruebusch, Daniel J.,Jamshidi, Arash,Kapadia, Rehan,Lee, Rebecca,Seok, Tae Joon,Takei, Kuniharu,Cho, Kee Young,Fan, Zhiyoung,Jang, Hwanung,Wu, Ming,Cho, Gyoujin,Javey, Ali American Chemical Society 2011 Nano letters Vol.11 No.8
<P>A high-throughput process for nanotexturing of hard and soft surfaces based on the roll-to-roll anodization and etching of low-cost aluminum foils is presented. The process enables the precise control of surface topography, feature size, and shape over large areas thereby presenting a highly versatile platform for fabricating substrates with user-defined, functional performance. Specifically, the optical and surface wetting properties of the foil substrates were systematically characterized and tuned through the modulation of the surface texture. In addition, textured aluminum foils with pore and bowl surface features were used as zeptoliter reaction vessels for the well-controlled synthesis of inorganic, organic, and plasmonic nanomaterials, demonstrating yet another powerful potential use of the presented approach.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-8/nl201862d/production/images/medium/nl-2011-01862d_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl201862d'>ACS Electronic Supporting Info</A></P>
Zhang, Xiaobo,Pint, Cary L.,Lee, Min Hyung,Schubert, Bryan Edward,Jamshidi, Arash,Takei, Kuniharu,Ko, Hyunhyub,Gillies, Andrew,Bardhan, Rizia,Urban, Jeffrey J.,Wu, Ming,Fearing, Ronald,Javey, Ali American Chemical Society 2011 NANO LETTERS Vol.11 No.8
<P>A simple approach is described to fabricate reversible, thermally- and optically responsive actuators utilizing composites of poly(<I>N</I>-isopropylacrylamide) (pNIPAM) loaded with single-walled carbon nanotubes. With nanotube loading at concentrations of 0.75 mg/mL, we demonstrate up to 5 times enhancement to the thermal response time of the nanotube-pNIPAM hydrogel actuators caused by the enhanced mass transport of water molecules. Additionally, we demonstrate the ability to obtain ultrafast near-infrared optical response in nanotube-pNIPAM hydrogels under laser excitation enabled by the strong absorption properties of nanotubes. The work opens the framework to design complex and programmable self-folding materials, such as cubes and flowers, with advanced built-in features, including tunable response time as determined by the nanotube loading.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2011/nalefd.2011.11.issue-8/nl201503e/production/images/medium/nl-2011-01503e_0002.gif'></P>
Ergen, Onur,Ruebusch, Daniel J.,Fang, Hui,Rathore, Asghar A.,Kapadia, Rehan,Fan, Zhiyong,Takei, Kuniharu,Jamshidi, Arash,Wu, Ming,Javey, Ali American Chemical Society 2010 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.132 No.40
<P>Highly regular, single-crystalline nanopillar arrays with tunable shapes and geometry are synthesized by the template-assisted vapor−liquid−solid growth mechanism. In this approach, the grown nanopillars faithfully reproduce the shape of the pores because during the growth the liquid catalyst seeds fill the space available, thereby conforming to the pore geometry. The process is highly generic for various material systems, and as an example, CdS and Ge nanopillar arrays with square, rectangular, and circular cross sections are demonstrated. In the future, this technique can be used to engineer the intrinsic properties of NPLs as a function of three independently controlled dimensional parameters - length, width and height.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2010/jacsat.2010.132.issue-40/ja1052413/production/images/medium/ja-2010-052413_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja1052413'>ACS Electronic Supporting Info</A></P>
Ordered Arrays of Dual-Diameter Nanopillars for Maximized Optical Absorption
Fan, Zhiyong,Kapadia, Rehan,Leu, Paul W.,Zhang, Xiaobo,Chueh, Yu-Lun,Takei, Kuniharu,Yu, Kyoungsik,Jamshidi, Arash,Rathore, Asghar A.,Ruebusch, Daniel J.,Wu, Ming,Javey, Ali American Chemical Society 2010 Nano letters Vol.10 No.10
<P>Optical properties of highly ordered Ge nanopillar arrays are tuned through shape and geometry control to achieve the optimal absorption efficiency. Increasing the Ge materials filling ratio is shown to increase the reflectance while simultaneously decreasing the transmittance, with the absorbance showing a strong diameter dependency. To enhance the broad band optical absorption efficiency, a novel dual-diameter nanopillar structure is presented, with a small diameter tip for minimal reflectance and a large diameter base for maximal effective absorption coefficient. The enabled single-crystalline absorber material with a thickness of only 2 μm exhibits an impressive absorbance of ∼99% over wavelengths, λ = 300−900 nm. These results enable a viable and convenient route toward shape-controlled nanopillar-based high-performance photonic devices.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2010/nalefd.2010.10.issue-10/nl1010788/production/images/medium/nl-2010-010788_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl1010788'>ACS Electronic Supporting Info</A></P>