Nanotechnology Now

Our NanoNews Digest Sponsors

Heifer International

Wikipedia Affiliate Button

Home > Press > Highly stable graphene-based ultrathin films: a covalent protocol

Abstract:
The unique atomic thick two-dimensional structural feature and outstanding electronic properties of graphene-based materials endow them with fertile opportunities as high-performance active electronic materials or as electrodes in the next generation nanoelectronics. The assembly of graphene-based materials to formulated ultrathin films over large area surface in a controllable manner is one of the most indispensable prerequisites to this end. Great progress has been made in this direction, yet there is much to be investigated to produce graphene-based multilayered films with excellent stability such that the formulated films could withstand the multi-step post-production process in the practical applications.

Highly stable graphene-based ultrathin films: a covalent protocol

Germany | Posted on December 11th, 2012

By taking the advantage of the presence of chemically reactive hydroxyl and epoxide groups on the basal plane of graphene oxide (GO), which is a novel cousin of the pristine graphene, Chinese scientists have now shown how to integrate such highly stable graphene-based multilayered film via a novel covalent-based protocol. Using (3-aminopropyl) trimethoxysilane (APTMS), which has chemically reactive amino and alkoxysilane groups at the opposite ends of the molecule, as a cross-linkage, the scientists demonstrated that GO nanosheets could be firmly immobilized on the hydroxylated solid substrates (for examples quartz, silicon or SiO2/Si wafer etc.) in a layer-by-layer (LBL) manner.

In thus-formulated multilayered (APTMS/GO)N films, the GO nanosheets were not simply stuck to but covalently grown on the substrates owing to the chemical reactions of the amino and alkoxysilane groups of APTMS with the epoxy and hydroxyl groups of GO, respectively (see below).

A thermal annealing treatment at an appropriate temperature could lead to the formation of reduced GO (RGO) films, (APTMS/RGO)N, which could retain their basic covalent structural features very well. The results showed that compared with the conventional LBL GO or RGO films constructed via electrostatic interactions, those assembled via the present covalent protocol, could display much higher stability and reproducibility, wherein the former were destroyed significantly upon a 15 minutes' ultrasonication treatment in water while the latter could survive themselves very well even when they were ultrasonicated sufficiently for 135 minutes (see graphs on the right, and click to magnify). "The excellent stability of our covalent films might provide new opportunities for their practical applications to withstand multi-step post-production, which is always encountered in practice. ", say the researchers. As a preliminary example for the potential application of these covalently assembled films, organic field-effect transistors (OFETs) were fabricated by using the (APTMS/RGO)N films as the source/drain electrodes.

The results showed that when the number of bilayers of the (APTMS/RGO)N films exceeded 2 (ca. 2.7 nm), the devices based on the (APTMS/RGO)N electrodes could display much higher electrical performances than that of the devices using 40 nm Au as electrodes. To generalize and expand this covalent approach, the researchers expect that the use of functional cross-link agents with intrinsic advanced physicochemical properties themselves might provide more opportunities not only for the highly stable and high-performance electrode in OFETs, but also for some other issues, for example chemical and biochemical sensors, electrochemical pseudocapacitor, optoelectronics, high efficiency catalysis, etc. The researchers believe that this covalent protocol might help to develop multilayered graphene-based films with more advanced functions.

####

For more information, please click here

Copyright © Wiley-VCH Materials Science Journals

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

Link to the original paper on Wiley Online Library:

Related News Press

Videos/Movies

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 2017

News and information

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 2017

Gold shines through properties of nano biosensors: Researchers discover that fluorescence in ligand-protected gold nanoclusters is an intrinsic property of the gold particles themselves August 16th, 2017

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

Scientists from the University of Manchester and Diamond Light Source work with Deben to develop and test a new compression stage to study irradiated graphite at elevated temperatures August 15th, 2017

Oxford Instruments Plasma Technology announces a new partner in Korea August 15th, 2017

Chemistry

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

Clarifiying complex chemical processes with quantum computers August 3rd, 2017

Strem Chemicals Surpasses ChemStewards® Requirements: Strem Qualifies for SOCMA’s “Excellence” Ranking August 3rd, 2017

Graphene/ Graphite

From hot to cold: How to move objects at the nanoscale: Moving a single gold nanocluster on a graphene membrane, thanks to a thermal gradient applied to the borders: a new study sheds light on the physical mechanisms driving this phenomenon August 10th, 2017

Controlled manipulation: Scientists at FAU are investigating the properties of hybrid systems consisting of carbon nanostructures and a dye August 8th, 2017

Sensors

Sensing technology takes a quantum leap with RIT photonics research: Office of Naval Research funds levitated optomechanics project August 10th, 2017

Giant enhancement of electromagnetic waves revealed within small dielectric particles: Scientists have done for the first time direct measurements of giant electromagnetic fields July 8th, 2017

Bosch announces high-performance MEMS acceleration sensors for wearables June 27th, 2017

Leti’s Autonomous-Vehicle System Embedded in Infineon’s AURIX Platform: Leti’s Low-Power, Multi-Sensor System that Transforms Distance Data into Clear Information About the Driving Environment Will Be Demonstrated at ITS Meeting in Strasbourg, June 19-22 June 20th, 2017

Nanoelectronics

GLOBALFOUNDRIES Demonstrates 2.5D High-Bandwidth Memory Solution for Data Center, Networking, and Cloud Applications: Solution leverages 2.5D packaging with low-latency, high-bandwidth memory PHY built on FX-14™ ASIC design system August 9th, 2017

GLOBALFOUNDRIES, Silicon Mobility Deliver the Industry’s First Automotive FPCU to Boost Performance for Hybrid and Electric Vehicles: Silicon Mobility and GF’s 55nm LPx -enabled platform, with SST’s highly-reliable SuperFlash® memory technology, boosts automotive performance, ene August 3rd, 2017

Scientists discover new magnet with nearly massless charge carriers July 29th, 2017

Atomic discovery opens door to greener, faster, smaller electronic circuitry: Scientists find way to correct communication pathways in silicon chips, making them perfect July 27th, 2017

Discoveries

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 2017

Gold shines through properties of nano biosensors: Researchers discover that fluorescence in ligand-protected gold nanoclusters is an intrinsic property of the gold particles themselves August 16th, 2017

Fewer defects from a 2-D approach August 15th, 2017

Scientists from the University of Manchester and Diamond Light Source work with Deben to develop and test a new compression stage to study irradiated graphite at elevated temperatures August 15th, 2017

Announcements

Freeze-dried foam soaks up carbon dioxide: Rice University scientists lead effort to make novel 3-D material August 16th, 2017

Gold shines through properties of nano biosensors: Researchers discover that fluorescence in ligand-protected gold nanoclusters is an intrinsic property of the gold particles themselves August 16th, 2017

Two Scientists Receive Grants to Develop New Materials: Chad Mirkin and Monica Olvera de la Cruz recognized by Sherman Fairchild Foundation August 16th, 2017

Scientists from the University of Manchester and Diamond Light Source work with Deben to develop and test a new compression stage to study irradiated graphite at elevated temperatures August 15th, 2017

Battery Technology/Capacitors/Generators/Piezoelectrics/Thermoelectrics/Energy storage

Rice U. scientists map ways forward for lithium-ion batteries for extreme environments: Paper details developments toward high-temperature batteries July 27th, 2017

Regulation of two-dimensional nanomaterials: New driving force for lithium-ion batteries July 26th, 2017

Ultrathin device harvests electricity from human motion July 23rd, 2017

Argonne National Laboratory’s Continuous ALD Technology Licensed Exclusively to Forge Nano July 7th, 2017

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project