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Dive into the research topics where Matthew Garrett is active.

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Featured researches published by Matthew Garrett.


Applied Physics Letters | 2010

Separation of junction and bundle resistance in single wall carbon nanotube percolation networks by impedance spectroscopy

Matthew Garrett; Ilia N. Ivanov; Rosario A. Gerhardt; Alex A. Puretzky; David B. Geohegan

Single wall carbon nanotube (SWNT) networks of different loadings were measured by impedance spectroscopy. The resistances of the junctions and bundles have been separated by modeling ac impedance spectroscopy data to an equivalent circuit of two parallel resistance-capacitance elements in series. The junction resistance was found to be 3–3.5 times higher than the bundle resistance. The dc and ac properties of the SWNT networks were found to obey a percolation scaling law, with parameters determined by dispersant type and SWNT purity. The values of the critical exponent in all cases were higher than the expected value of 1.3, which is related to widely distributed bundle and junction conductivities.


Archive | 2013

Carbon Nanotube Assemblies for Transparent Conducting Electrodes

Ilia N. Ivanov; Matthew Garrett; Rosario A. Gerhardt

The goal of this chapter is to introduce readers to the fundamental and practical aspects of nanotube assemblies made into transparent conducting networks and discuss some practical aspects of their characterization. Transparent conducting coatings (TCC) are an essential part of electro-optical devices, from photovoltaics and light emitting devices to electromagnetic shielding and electrochromic widows. The market for organic materials (including nanomaterials and polymers) based TCCs is expected to show a growth rate of 56.9% to reach nearly


Archive | 2007

Transparent conductive nano-composites

David B. Geohegan; Ilia N. Ivanov; Alexander A. Puretzky; Stephen Jesse; Bin Hu; Matthew Garrett; Bin Zhao

20.3 billion in 2015, while the market for traditional inorganic transparent electronics will experience growth with rates of 6.7% to nearly


Carbon | 2013

Effect of purity on the electro-optical properties of single wall nanotube-based transparent conductive electrodes

Matthew Garrett; Ilia N. Ivanov; David B. Geohegan; Bin Hu

103 billion in 2015. Emerging flexible electronic applications have brought additional requirements of flexibility and low cost for TCC. However, the price of indium (the major component in indium tin oxide TCC) continues to increase. On the other hand, the price of nanomaterials has continued to decrease due to development of high volume, quality production processes. Additional benefits come from the low cost, nonvacuum deposition of nanomaterials based TCC, compared to traditional coatings requiring energy intensive vacuum deposition. Among the materials actively researched as alternative TCC are nanoparticles, nanowires, and nanotubes with high aspect ratio as well as their composites. The figure of merit (FOM) can be used to compare TCCs made from dissimilar materials and with different transmittance and conductivity values. In the first part of this manuscript, we will discuss the seven FOM parameters that have been proposed, including one specifically intended for flexible applications. The approach for how to measure TCE electrical properties, including frequency dependence, will also be discussed. We will relate the macroscale electrical characteristics of TCCs to the nanoscale parameters of conducting networks. The fundamental aspects of nanomaterial assemblies in conducting networks will also be addressed. We will review recent literature on TCCs composed of carbon nanotubes of different types in terms of the FOM.


Organic Electronics | 2011

Effects of single walled carbon nanotubes on the electroluminescent performance of organic light-emitting diodes

Ming Shao; Matthew Garrett; Xinjun Xu; Ilia N. Ivanov; Stanislaus S. Wong; Bin Hu


Archive | 2011

Percolative Conductive Network and Conductive Polymer Composite

Ilia N. Ivanov; Matthew Garrett; Rosario A. Gerhardt; John M. Boyea


Archive | 2009

Single Walled Carbon Nanotube Networks as Transparent Conductors

Matthew Garrett


Archive | 2007

Transparente leitende nanokomposite

David B. Geohegan; Ilya N. Ivanov; Alexander A. Puretzky; Stephen Jesse; Bin Hu; Matthew Garrett; Bin Zhao


Bulletin of the American Physical Society | 2007

Towards an optimal nanotube dispersion for transparent conductive coatings

Matthew Garrett; Ilia N. Ivanov; Bin Zhao; Alex A. Puretzky; David B. Geohegan


Bulletin of the American Physical Society | 2006

Effect of doping on electro-optical properties of thin carbon nanotube membranes

Matthew Garrett; Ilia N. Ivanov; Bin Zhao; Alex A. Puretzky; David B. Geohegan

Collaboration


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Ilia N. Ivanov

Oak Ridge National Laboratory

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David B. Geohegan

Oak Ridge National Laboratory

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Alex A. Puretzky

Oak Ridge National Laboratory

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Bin Hu

University of Tennessee

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Bin Zhao

Oak Ridge National Laboratory

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Rosario A. Gerhardt

Georgia Institute of Technology

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Stephen Jesse

Oak Ridge National Laboratory

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Alexander A. Puretzky

Oak Ridge National Laboratory

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Douglas H. Lowndes

Oak Ridge National Laboratory

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Kai Xiao

Oak Ridge National Laboratory

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