Gorging on burgers at Eureka! in Irvine, November 2014.

Gold Nanowire Thermophones

Rajen Dutta, Brian Albee, Wytze E. van der Veer, Keith C. Donovan, Dimitri Papamoschou, Reginald M. Penner*
J. Phys. Chem. C, 118 (2014) in press.
10.1021/jp504195v

Ultra-long (mm scale) polycrystalline gold nanowires can function as loud speakers. Raj fabricated arrays of 4000 linear gold nanowires at 5 micron pitch on glass surfaces using lithographically patterned nanowire electrodeposition (LPNE). Then he evaluated the properties of these nanowire arrays for generating sound as a function of frequency (from 5 - 120 kHz), angle from the plane of the nanowires, input power (from 0.30 - 2.5 W) and the width of the nanowires in the array (from 270 to 500 nm.)



Electrodeposited Nanophotonics

Reginald M. Penner*
J. Phys. Chem. C, 118 (2014) 17179.
10.1021/jp5037074

We review the use of electrodeposited, polycrystalline (pc), cadmium selenide (CdSe) in nanowires and nanogap device structures for photonics. The photodetectors and photon emitters we describe are symmetrical metal-semiconductor-metal (M-S-M) devices prepared either by the evaporation of two gold contacts onto linear arrays of pc-CdSe nanowires prepared using lithographically patterned nanowires electrodeposition (LPNE), or by the electrodeposition of pc-CdSe directly onto gold nanogaps.



A Lithographically Patterned Capacitor With Horizontal Nanowires of Length 2.5 mm Wenbo Yan, Mya Le Thai, Rajen Dutta, Xiaowei Li, Wendong Xing, and Reginald M. Penner*
ACS App. Mat. Interf., 6 (2014) 5018.
10.1021/am500051d

Wenbo prepared a symmetrical hybrid capacitor consisting of interdigitated, horizontal nanowires. Each of the 750 nanowires within the capacitor is 2.5 mm in lengt - yes that's right - 1 cm! Each nanowire consisted of a gold nanowire core (40 x 200 nm) encapsulated within a hemicylindrical shell of delta-phase MnO2 (thickness = 60--220 nm). Wenbo patterned these Au@MnO2 nanowires on a planar glass surface using lithographically patterned nanowire electrodeposition (LPNE). She measured a power density of 165 kW/kg and an energy density of 24 Wh/kg for a nanowire array in which the MnO2 shell thickness was 68 nm.



Reduction of Spectral Interferences Using Ultraclean Gold Nanowire Array in the LDI-MS Analysis of Peptides L. Colaianni; S.C. Kung, D.K. Taggart; R.A. Picca, J. Greaves, R.M. Penner, and N. Cioffi*
Analytical and Bioanalytical Chemistry, 406 (2014) 4571.
10.1007/s00216-014-7876-7

Lorenzo and Nicola assessed the utility of gold nanowire arrays (AuNWAs) as anchors in the matrix-free laser desorption ionization mass spectrometry (LDI-MS) analysis of the low molecular weight peptide leucine enkephalin. Then, Lorenzo subjected these AuNWAs to a series of cleaning procedures. Iinterference-free, intense, mass spectrometra were obtained for leucine enkephalin characterized by limits of detection as low as 0.5 and 2.5 pmol for the positive and negative analysis modes, respectively.




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© 2014, Reginald M. Penner