Aligned nanowire growth using lithography-assisted bonding of a polycarbonate template for neural probe electrodes

Yoon, Hargsoon; Deshpande, Devesh C.; Ramachandran, Vasuda; Varadan, Vijay K.

doi:10.1088/0957-4484/19/02/025304

Cited by 43 publications

(40 citation statements)

References 44 publications

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“…These aligned NW arrays can be fabricated using electrodeposition into sacrificial porous membranes, [11][12][13] which is an inexpensive, scalable, and tunable method to rapidly and controllably synthesize vertically-aligned metal NWs over large areas. The porous membranes, which are commonly either anodized aluminum oxide (AAO) 11,[14][15][16][17][18][19][20][21][22][23][24][25][26] or polycarbonate track-etched (PCTE) membranes, 12,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] are used as templates to confine metal deposition to the cylindrical pores, after which the membrane is dissolved. Many arrayscale properties (e.g.…”

Section: Introductionmentioning

confidence: 99%

Thermal Conduction in Vertically Aligned Copper Nanowire Arrays and Composites

Barako

Roy-Panzer

English

et al. 2015

ACS Appl. Mater. Interfaces

103

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The ability to efficiently and reliably transfer heat between sources and sinks is often a bottleneck in the thermal management of modern energy conversion technologies ranging from microelectronics to thermoelectric power generation. These interfaces contribute parasitic thermal resistances that reduce device performance and are subjected to thermomechanical stresses that degrade device lifetime. Dense arrays of vertically aligned metal nanowires (NWs) offer the unique combination of thermal conductance from the constituent metal and mechanical compliance from the high aspect ratio geometry to increase interfacial heat transfer and device reliability. In the present work, we synthesize copper NW arrays directly onto substrates via templated electrodeposition and extend this technique through the use of a sacrificial overplating layer to achieve improved uniformity. Furthermore, we infiltrate the array with an organic phase change material and demonstrate the preservation of thermal properties. We use the 3ω method to measure the axial thermal conductivity of freestanding copper NW arrays to be as high as 70 W m(-1) K(-1), which is more than an order of magnitude larger than most commercial interface materials and enhanced-conductivity nanocomposites reported in the literature. These arrays are highly anisotropic, and the lateral thermal conductivity is found to be only 1-2 W m(-1) K(-1). We use these measured properties to elucidate the governing array-scale transport mechanisms, which include the effects of morphology and energy carrier scattering from size effects and grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Thermal Conduction in Vertically Aligned Copper Nanowire Arrays and Composites

Barako

Roy-Panzer

English

et al. 2015

ACS Appl. Mater. Interfaces

103

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“…The vertically aligned nanowires were fabricated using a hybrid assembly method of nanopore membrane and electrochemical deposition processes on a silicon substrate, details are explained further in [15,16]. First, a 2 mm insulating layer of SiO 2 was deposited on 125 mm, (111) Si wafers.…”

Section: Methodsmentioning

confidence: 99%

Dual Electrode Ensembles with Core and Shell Nanoelectrodes for Dopamine Sensing Applications

et al. 2008

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This paper presents the fabrication of dual electrode ensembles for electrochemical sensing of dopamine. A new dual electrode ensemble consists of vertically aligned core nanowire electrodes and a shell electrode with a hemicylindrical nanocavity structure and submicron inter-electrode spacing between the two working electrodes. By using a 3-dimensional cavity structure of two working electrodes, collection efficiency in redox cycling of dopamine is enhanced. Initial measurement results show the ability to detect 200 mM concentration of dopamine with 69% collection efficiency on a dual electrode ensemble.

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“…In the nanowire electrode design for neural sensing in [9][10][11], the distance between the nanowires was assumed to be 400 nm and the depth of the channels has the value of 1 µm in this study. For nanogrid electrode simulation, the gap between the sensing core and the shielding grid structures was set as 100 nm.…”

Section: Simulationmentioning

confidence: 99%

“…Here, an electrochemical molecular diffusion analysis using 2-dimensional finite element modeling is studied in relation with the electrode impedance property of nanoelectrodes. The analysis is based on our previous development of neural sensing electrodes using vertically aligned nanowires [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical investigation of nano-electrodes for biomedical sensing applications in the brain

et al. 2011

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Using neural probing devices implanted in the brain, neural activity from neural cells can be recorded in-vivo for long term periods. This research goal is to develop and investigate a neural sensing device using nanotechnology which can enhance the quality and longevity of sensing. In this research, two neural electrode designs were employed with nanostructures, which distinguish them from 2-dimensional planar electrode configuration. According to electrochemical simulation, high molecular confinement has been observed on vertically aligned nanowire electrodes, especially those with grid structures. The efficacy of the 3-dimensional nanoelectrode is also discussed in this paper, depending on the molecular diffusion on nanoelectrodes.

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Aligned nanowire growth using lithography-assisted bonding of a polycarbonate template for neural probe electrodes

Cited by 43 publications

References 44 publications

Thermal Conduction in Vertically Aligned Copper Nanowire Arrays and Composites

Thermal Conduction in Vertically Aligned Copper Nanowire Arrays and Composites

Dual Electrode Ensembles with Core and Shell Nanoelectrodes for Dopamine Sensing Applications

Electrochemical investigation of nano-electrodes for biomedical sensing applications in the brain

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