Reduced Graphene Oxide Sensors

GRAPHENE SENSOR:
Graphene has some unusual characteristics that can be very good material for a wide range of applications from high speed electronics and solar cells to super sensor which is capable of detecting single molecules of toxic gases.
This sensor can react to any molecule that touches it surfaces because it’s entire structure is displayed to surrounding around it. By these, graphene electrical properties are altered because it senses molecular presence. Because graphene is very sensitive, it has been seen that when coated with polymer, it protected from all contaminates. these new senors and inexpensive to produce and are much more sensitive.

Here’s a few articles I thought were interesting.

 

https://plus.google.com 03/18/2014 13:27

Graphene sensors could create night-vision contact lenses

http://www.dezeen.com/2014/03/18/graphene-sensors-could-create-night-vision-contact-lenses/

#news #design

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This is very exciting!

Graphene-based Sensor Brings New Wrinkle to Wearables – IEEE Spectrum

http://news.google.com Wed, 13 Aug 2014 09:26:56 GMT

IEEE SpectrumGraphene-based Sensor Brings New Wrinkle to WearablesIEEE SpectrumThe researchers claim that the graphene made this sensing technique possible, resulting in extremely fast response times of tenths of a second as opposed to tens or hundre …

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ORNL teams embeds crown ethers in graphene for …

http://www.greencarcongress.com/ Sun, 28 Dec 2014 04:36:00 -0800

Their strong, specific electrostatic binding may advance sensors, chemical separations, nuclear-waste cleanup, extraction of metals from ores, purification and recycling of rare-earth elements, water purification, biotechnology, energy production in durable lithium-ion batteries, catalysis, medicine and data storage. … Cristian Contescu and Nidia Gallego started with graphite, oxidized it to form graphene oxide and then reduced that to form graphene. Because reduction …Read more …

AmericanDailyRecord

Thu Jan 01 23:12:27 +0000 2015

2014/10/20 Atom-width Graphene Sensors Could Provide Unprecedented Insights into Brain Structure and Function : http://t.co/jZjG3W9QkK

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Ammonia gas sensors based on chemically reduced …

http://www.nanoscalereslett.com/content/7/1/441 Tue, 20 May 2014 17:00:00 -0700

We present a useful ammonia gas sensor based on chemically reduced graphene oxide (rGO) sheets by self-assembly technique to create conductive networks between parallel Au electrodes. Negative graphene oxide (GO) …Read more …

https://plus.google.com 09/20/2013 0:23

Graphene Aerogel, an Outlook

APL Materials, is a new journal which will feature original research on significant topical issues within the field of materials science.

In the newest on line version is an article, Perspective: Graphene aerogel goes to superelasticity and ultraflyweight, authored by Zhen Xu, Haiyan Sun, and Chao Gao_ ⓐ

The research was done at the MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, People’s Republic of China.

I wanted to summarize what they have done, as it helped me to understand the latest in graphene aerogel research.

Since the first mechanical exfoliation of graphene by Geim and Novoselov in 2004, this kind of two-dimensional (2D) plate with atomic thickness has become the thinnest toy brick in the hand of curious materials scientists. Many macroscopic materials such as graphene-based planar films and one-dimensional (1D) graphene fibers with high mechanical strength and robust electrical functionalities were created for the possibly realistic applications in the graphene rush. Another hot material was graphene-based 3D interconnected frameworks with attractive combination performances of low density, high porosity, and fine electrical conductivity, harnessing the superior properties of the fundamental graphene building blocks in the wide application fields, such as energy storage, adsorbing materials, catalysts, and sensors.

They discuss methods of making a graphene-based 3D framework. One is:

_template-directed chemical vapor deposition (CVD) and fluid assembly from solvated graphene. After etching away the template, the resulting graphene foam was infiltrated with poly(dimethyl siloxane), giving rise to flexible and conductive composites._ ⓐ

Another is: fluid assembly of graphene oxide by hydrothermal treatment, freeze-drying, and critical point drying that can be used for large scale production of graphene aerogel.

They discuss another method that used 2D graphene sheets with giant size and 1D multi-walled carbon nanotubes (MWCNTs) as the two synergistic building blocks to scalably construct ultralight superelastic carboneous aerogel (panel (a) in Figure 1 and the inset in Figure 1b) with the recorded lowest density down to 0.16 mg/cm3 and super reversible compressibility in the wide temperature range between the extremely low −196 °C in liquid nitrogen and high testable 300 °C. ⓐ (The figures are down below)

The atomically thick graphene sheets are definitely the ideal building blocks to pursue the extreme lightness of carboneous materials. We massively synthesized single-layered giant graphene oxide (GGO) sheets with average lateral width of 18.5 μm (an aspect width to thickness ratio of 23 000) as the structural cell for the fabrication of ultralight graphene aerogel. Through lyophilisation of the GGO aqueous dispersions and following reduction, the lowest density of self-standing graphene aerogel (calculated by mass divided by volume) reached the recorded lowest density value about 0.16 mg/cm3, even lower than that of air under normal atmosphere at room temperature (1.25 mg/ cm3). This lowest density also approached to the theoretical value (about 0.074 mg/cm3) from the geometrical analysis using 18.5 μm width single layered graphene sheets as the interconnected blocks. The experimental results directly verified the function of giant graphene sheets for the fabrication of ultralight materials.

_The combination of ultralow density (extremely high porosity), super elasticity, and fine electrical conductivity of the graphene-based aerogels is of extraordinary significance to develop them as one kind of multifunctional material served in wide applications.15 The first application is foreseeable to be the first-class recycled absorbent to selectively absorb oil from water, which is very effective and useful to clean the leaked oil and the pollute compounds in the water system. Exemplified by our graphene-based synergistic aerogels, about 300 times-weight of crude oil can be absorbed into the aerogel’s pores, and 750 times for phenixin, which is two times higher than the previous record of CNT sponges, not to mention the ordinary commercial absorbents. Besides their excellent absorption capacity, these light and elastic graphene aerogels have promising usage as damping materials at extreme temperature conditions, conductive frameworks for functional composites, phase transition materials in energy saving, and chemical supercapacitors._ ⓐ

 

Graphene oxide could make textiles smarter – physicsworld.com

http://physicsworld.com/ Mar 2014

Smart textiles are those that incorporate electronic components such as displays, sensors and actuators.Read more …

http://aplmaterials.aip.org/resource/1/ampads/v1/i3/p030901_s1?view=fulltext&bypassSSO=1

The Figure Caption is:

The ultraflyweight graphene-CNT synergistic elastic sponge standing on the tips of long-stemmed grass (a) and its constituent CNT-sandwiched graphene building block imaged under TEM (b) and its structural cartoon (c). SEM tracking inspection on an elastic CNT-sandwiched graphene sheet under a compress-release cycle, illustrating the elastic nature of the basic building block (d). Scale bar in the inset picture is 20 μm, and the others are 2 μm. Read more …

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Reduced Graphene Oxide News

Reduced Graphene Oxide NewsElectrochromism in graphene – 1

We demonstrate that graphene oxide can be reversibly reduced and oxidized using electrical stimulus. Controlled reduction and oxidation in two-terminal devices containing multilayer graphene oxide films are shown to result in switching between partia…

Electrochromism in graphene – 2

We demonstrate that graphene oxide can be reversibly reduced and oxidized using electrical stimulus. Controlled reduction and oxidation in two-terminal devices containing multilayer graphene oxide films are shown to result in switching between partia…

Reduced Graphene Oxide

Graphene oxide by analogy to graphene, the single-layer form of graphite.  Graphene oxide sheets have been used to prepare a strong paper like materials, and have recently attracted interest manufacture of graphene. Graphene research is exploding all over the world. just take a look at graphene news sites and you will see how many new breakthroughs and discoveries there are.

Science & Research Roundup: Oct. 31 – The Brown Daily Herald

news.google.com

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Science & Research Roundup: Oct. 31The Brown Daily Herald“(Platinum) is very expensive and has a very limited supply,” said Shouheng Sun PhD’96, professor of chemistry, who worked with students to develop the new catalyst — a graphene sheet made of h …

Charging of nanostructured and partially reduced graphene oxide sheets – Graphene Times

http://graphenetimes.com/Nov 2

Two-Dimensional News and Commentary.

Graphene appears to be the most effective material for EMI shielding – Nanowerk LLC

news.google.com

Nanowerk LLCGraphene appears to be the most effective material for EMI shieldingNanowerk LLCThere have been experimental reports and theoretical analysis about the shielding effectiveness of graphene. But in these previous works, the researchers used …

 

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TinyTechIP: US Patent 8182917 – Reduced graphene oxide film

tinytechip.blogspot.com5/23/12

US Patent 8182917 – Reduced graphene oxide film. http://www.freepatentsonline.com/8182917.html. This patent is based on research conducted by the U.S. Navy and teaches producing a large area of thin film graphene

ScienceIndex_

http://t.co/lGwl5mQP Self-assembly of graphene oxide and polyelectrolyte complex nanohybrid membranes for… http://t.co/ddCdTtrm

Sunday, November 11, 2012 5:23:36 AM

Production of Graphene-Based Nanocomposite to Adsorb Water Pollutants – Nanotechnology News (press release)

news.google.com

Nanotechnology News (press release)Production of Graphene-Based Nanocomposite to Adsorb Water PollutantsNanotechnology News (press release)Results of the research showed that the synthesis of TiO2 in an ionic solution and the addition of cerium oxide …

Reduced graphene oxide

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