In situ reduction of gold nanoparticles in PDMS matrices and applications for large strain sensing

Ryu, Donghyeon; Loh, Kenneth J.; Ireland, Robert M.; Karimzada, Mohammad; Yaghmaie, Frank; Gusman, Andrea M.

doi:10.12989/sss.2011.8.5.471

Cited by 57 publications

(46 citation statements)

References 14 publications

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“…This transition from insulator to conductor is attributed to the formation of conductive pathways within the composite. Similarly to the previous studies of composite materials with some degree of axial organization of NPs into bands and chains, the present samples show much improved electrical transport as well as interesting optical properties originating from plasmonic effects …”

Section: Resultssupporting

confidence: 79%

“…They show promise as wearable electronic devices, biosensors, high performance batteries, and neural implants . While these composites are mostly based on carbon nanostructures, a lot of them were made from metal nanoparticles (NPs) . However, the metal NP content in these composites is usually low except several cases of hybrid materials specifically designed for high volume fraction of inorganic components .…”

Section: Introductionmentioning

confidence: 99%

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High Strength Conductive Composites with Plasmonic Nanoparticles Aligned on Aramid Nanofibers

Lyu

Wang

Liu

et al. 2016

Adv Funct Materials

125

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Rapidly evolving fields of biomedical, energy, and (opto)electronic devices bring forward the need for deformable conductors with constantly rising benchmarks for mechanical properties and electronic conductivity. The search for conductors with improved strength and strain have inspired the multiple studies of nanocomposites and amorphous metals. However, finding conductors that defy the boundaries of classical materials and exhibit simultaneously high strength, toughness, and fast charge transport while enabling their scalable production, remains a difficult materials engineering challenge. Here, composites made from aramid nanofibers (ANFs) and gold nanoparticles (Au NPs) that offer a new toolset for engineering high strength flexible conductors are described. ANFs are derived from Kevlar macrofibers and retain their strong mechanical properties and temperature resilience. Au NPs are infiltrated into a porous, free-standing aramid matrix, becoming aligned on ANFs, which reduces the charge percolation threshold and facilitates charge transport. Further thermal annealing at 300 °C results in the Au-ANF composites with an electrical conductivity of 1.25 × 10 4 S cm −1 combined with a tensile strength of 96 MPa, a Young's modulus of 5.29 GPa, and a toughness of 1.3 MJ m −3 . These para meters exceed those of most of the composite materials, and are comparable to those of amorphous metals but have no volume limitations. The plasmonic optical frequencies characteristic for constituent NPs are present in the composites with ANFs enabling plasmon-based optoelectronic applications.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

High Strength Conductive Composites with Plasmonic Nanoparticles Aligned on Aramid Nanofibers

Lyu

Wang

Liu

et al. 2016

Adv Funct Materials

125

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“…The transflectance measurements allowed for the absorbance, A, of the films to be determined by A = −log(T+R). The concentration, C, of 1-Al within the PDMS films was then calculated using the Beer-Lambert law, A = εCl, where ε is the extinction coefficient of the dye and l is the film thickness (determined by profilometry, see below)[35– 37]. The absorbance values at 426 and 595 nm (corresponding to the Soret and Q bands of the dye, respectively) for the PDMS film containing the 1-Al -functionalized TiO 2 nanoparticles, the estimated extinction coefficients of 1-Al at these wavelengths, and the film thicknesses are provided in Table A.2 of Appendix A.…”

Section: Methodsmentioning

confidence: 99%

Cellular uptake and cytotoxicity of a near-IR fluorescent corrole–TiO2 nanoconjugate

Blumenfeld

Sadtler

Fernández

et al. 2014

Journal of Inorganic Biochemistry

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We are investigating the biological and biomedical imaging roles and impacts of fluorescent metallocorrole-TiO 2 nanoconjugates as potential near-infrared optical contrast agents in vitro in cancer and normal cell lines. The TiO 2 nanoconjugate labeled with the small molecule 2,17-bis(chlorosulfonyl)-5,10,15-tris(pentafluorophenyl)corrolato aluminum(III) (1-Al-TiO 2 ) was prepared. The nanoparticle 1-Al-TiO 2 was characterized by transmission electron microscopy (TEM) and integrating-sphere electronic absorption spectroscopy. TEM images of three different samples of TiO 2 nanoparticles (bare, H 2 O 2 etched, and 1-Al functionalized) showed similarity in shapes and sizes with an average diameter of 29 nm for 1-Al-TiO 2 . Loading of 1-Al on the TiO 2 surfaces was determined to be ca. 20-40 mg 1-Al/g TiO 2 . Confocal fluorescence microscopy (CFM) studies of luciferase-transfected primary human glioblastoma U87-Luc cells treated with the nanoconjugate 1-Al-TiO 2 as the contrast agent in various concentrations were performed. The CFM images revealed that 1-Al-TiO 2 was found inside the cancer cells even at low doses (0.02-2 µg/mL) and localized in the cytosol. Bioluminescence studies of the U87-Luc cells exposed to Corresponding authors: Karn Sorasaenee, ksorasaenee@chla.usc.edu and Harry B. Gray, hbgray@caltech.edu.Publisher's Disclaimer: This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. HHS Public Access Author Manuscript Author ManuscriptAuthor ManuscriptAuthor Manuscript various amounts of 1-Al-TiO 2 showed minimal cytotoxic effects even at higher doses (2-2000 µg/mL) after 24 h. A similar observation was made using primary mouse hepatocytes (PMH) treated with 1-Al-TiO 2 at low doses (0.0003-3 µg/mL). Longer incubation times (after 48 and 72 h for U87-Luc) and higher doses (> 20 µg/mL 1-Al-TiO 2 for U87-Luc and > 3 µg/mL 1-Al-TiO 2 for PMH) showed decreased cell viability. Graphical AbstractSynopsis for the graphic abstract Fluorescence (shown in red) from the corrole nanoconjugate 1-Al-TiO 2 internalized in the glioblastoma U87-Luc cell.

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“…Active materials for flexible sensors include metal nanoparticles, several NWs, CNTs and graphene, rubber dielectric layers, porous silicon and organic chemiresistors and field‐effect transistors . The diversity of stretchable substrates, such as polyimide and polydimethylsiloxane (PDMS) adds an additional control to the design and performance of the sensors towards the targeted use.…”

Section: Nanomaterial‐based Flexible Sensors For Volatolomic Applicatmentioning

confidence: 99%

Nanoscale Sensor Technologies for Disease Detection via Volatolomics

Vishinkin

Haick

2015

Small

172

209

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The detection of many diseases is missed because of delayed diagnoses or the low efficacy of some treatments. This emphasizes the urgent need for inexpensive and minimally invasive technologies that would allow efficient early detection, stratifying the population for personalized therapy, and improving the efficacy of rapid bed-side assessment of treatment. An emerging approach that has a high potential to fulfill these needs is based on so-called "volatolomics", namely, chemical processes involving profiles of highly volatile organic compounds (VOCs) emitted from body fluids, including breath, skin, urine and blood. This article presents a didactic review of some of the main advances related to the use of nanomaterial-based solid-state and flexible sensors, and related artificially intelligent sensing arrays for the detection and monitoring of disease with volatolomics. The article attempts to review the technological gaps and confounding factors related to VOC testing. Different ways to choose nanomaterial-based sensors are discussed, while considering the profiles of targeted volatile markers and possible limitations of applying the sensing approach. Perspectives for taking volatolomics to a new level in the field of diagnostics are highlighted.

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In situ reduction of gold nanoparticles in PDMS matrices and applications for large strain sensing

Cited by 57 publications

References 14 publications

High Strength Conductive Composites with Plasmonic Nanoparticles Aligned on Aramid Nanofibers

High Strength Conductive Composites with Plasmonic Nanoparticles Aligned on Aramid Nanofibers

Cellular uptake and cytotoxicity of a near-IR fluorescent corrole–TiO2 nanoconjugate

Nanoscale Sensor Technologies for Disease Detection via Volatolomics

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