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Switching graphene nanoribbons from conductive to semiconducting

Switching graphene nanoribbons from conductive to semiconducting | Psychology and matter | Scoop.it

Theoretical physicists at Rice University have figured out how to custom-design graphene nanoribbons by controlling the conditions under which the nanoribbons are pulled apart to get the edges they need for specific mechanical and electrical properties, such as metallic (for chip interconnects, for example) or semiconducting (for chips).


The new research by Rice physicist Boris Yakobson and his colleagues appeared this month in the Royal Society of Chemistry journal Nanoscale. Perfect (pristine) graphene is conductive and looks like chicken wire, with each six-atom unit forming a hexagon, with edges that are zigzags like this: /\/\/\/\/\/\/\/\ .


Turning the hexagons 30 degrees makes the edges “armchairs,” with flat tops and bottoms held together by the diagonals, making the nanoribbons both semiconducting and more stable.


The researchers used density functional theory, a computational method to analyze the energetic input of every atom in a model system, to learn how thermodynamic and mechanical forces would accomplish the goal.


Their study revealed that heating graphene to 1,000 kelvin and applying a low but steady force along one axis will crack it in such a way that fully reconstructed 5–7 rings will form and define the new edges. Conversely, fracturing graphene with low heat and high force is more likely to lead to pristine zigzags.


Via Dr. Stefan Gruenwald
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The calculations of excited-state properties with Time-Dependent Density Functional Theory

The calculations of excited-state properties with Time-Dependent Density Functional Theory | Psychology and matter | Scoop.it

In this tutorial review, we show how Time-Dependent Density Functional Theory (TD-DFT) has become a popular tool for computing the signatures of electronically excited states, and more specifically, the properties directly related to the optical (absorption and emission) spectra of molecules. We discuss the properties that can be obtained with widely available programs as well as how to account for the environmental effects (solvent and surfaces) and present recent applications in these fields. We next expose the transformation of the TD-DFT results into chemically intuitive parameters (colours as well as charge-transfer distances). Eventually, the non-specialised reader will find a series of advices and warnings necessary to perform her/his first TD-DFT calculations.

 

Carlo Adamo and Denis Jacquemin

Chem. Soc. Rev., 2013, Advance Article

DOI: 10.1039/C2CS35394F


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Karakuri dolls: The robots of premodern Japan

Karakuri dolls: The robots of premodern Japan | Psychology and matter | Scoop.it
For many, Japan equals technology and robots, and we can hardly blame them! Between Honda's Asimov and Professor Hiroshi Ishiguro's android, there's no shortage of exciting robotics news coming out of Japan.

Via Stephanie Lay
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Stephanie Lay's curator insight, June 10, 2013 11:50 AM

OK, I admit - these don't unsettle me in the same way that modern robots do but they're fascinating. 

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Zombies And Fake Hands: Why The Uncanny Valley Is So Damn Creepy

Zombies And Fake Hands: Why The Uncanny Valley Is So Damn Creepy | Psychology and matter | Scoop.it
We like things that are human, just not too human. We hate those.

Via Stephanie Lay
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Stephanie Lay's curator insight, September 18, 2014 3:56 AM

Oh, fascinating! Individual differences in susceptibility to the UVE. *rubs hands with glee* 

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Interesting infographic: How your brain sees a logo

Interesting infographic: How your brain sees a logo | Psychology and matter | Scoop.it
Rob Marsh, the author of Logomaker, put together this infographic based on research results he found in a number of journals. I found the progression from vague shapes to shape descriptions to bran...

Via Russ Merz, Ph.D., EarthquakeMachine
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CHEAP tricks...

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Russ Merz, Ph.D.'s curator insight, October 15, 2014 1:19 PM

A compilation of #neuroscience research findings from 8 studies that help explain how logos and other forms of visual communication are interpreted by the brain. It also suggests that there may be a link to behavior.

Dean Ryan G. Martin's curator insight, October 18, 2014 12:06 PM

This infographic reminds you to attract people with your logo. Your logo represents your brand. Your reputation depends on it too.

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Interesting infographic: How your brain sees a logo

Interesting infographic: How your brain sees a logo | Psychology and matter | Scoop.it
Rob Marsh, the author of Logomaker, put together this infographic based on research results he found in a number of journals. I found the progression from vague shapes to shape descriptions to bran...

Via Russ Merz, Ph.D.
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Russ Merz, Ph.D.'s curator insight, October 15, 2014 1:19 PM

A compilation of #neuroscience research findings from 8 studies that help explain how logos and other forms of visual communication are interpreted by the brain. It also suggests that there may be a link to behavior.

Dean Ryan G. Martin's curator insight, October 18, 2014 12:06 PM

This infographic reminds you to attract people with your logo. Your logo represents your brand. Your reputation depends on it too.

EarthquakeMachine's curator insight, November 1, 2014 7:53 PM

CHEAP tricks...

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Bilingual Brains – Smarter & Faster

Bilingual Brains – Smarter & Faster | Psychology and matter | Scoop.it
Better attention and cognition in children who grow up in bilingual settings.
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CASE EXAMPLE: how this "acting" stuff works for real life coping?

CASE EXAMPLE: how this "acting" stuff works for real life coping? | Psychology and matter | Scoop.it
There is always someone who can step on stage and steal the whole show. They are such a good actor/actress that they pull you into their world and leave you on the edge of your seat. Keep reading to find out how to be a great actor/actress...
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How to Use the Enneagram of Personality to Create Story Characters

How to Use the Enneagram of Personality to Create Story Characters | Psychology and matter | Scoop.it
Works about the Enneagram describing levels and variations of the 9 personality types are useful when choosing the attitudes and stances of a character.
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Positive affirmations...

Positive affirmations... | Psychology and matter | Scoop.it
100 Positive Affirmations prove you are special, you are enough, you are smart, you are worthy of love, you are important. Learn them now.
EarthquakeMachine's insight:

I used to hate this, but it's as superficial as the "user" could be... some of them are kinda goofy tho

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Face Reading Techniques

Face Reading Techniques | Psychology and matter | Scoop.it
Face reading techniques can prove to be very useful in your professional and personal lives. They will help you learn more about an individual and help you take a right decision.
EarthquakeMachine's insight:

(is there a correlation between facial proportions and psychology?)

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Handbook of Human Vibration: 9780123030412: Medicine & Health Science Books @ Amazon.com

Handbook of Human Vibration

~ M. J. Griffin (author) More about this product
List Price: $157.00
Price: $138.97
You Save: $18.03 (11%)
Handbook of Human Vibration: 9780123030412: Medicine & Health Science Books @ Amazon.com
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Male and Female Energy Energy and Frequency Vibration

Michael Educational Foundation
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Through a nanopore: Quantum graphene nanopore transistor for next-generation DNA sensing

Through a nanopore: Quantum graphene nanopore transistor for next-generation DNA sensing | Psychology and matter | Scoop.it

In the ongoing quest to devise faster, lower-cost methods for sequencing the human genome, scientists at University of Illinois at Urbana–Champaign have developed a novel approach: DNA molecules are sensed by passing them through a layer of constricted graphene embedded in a solid-state membrane containing a nanopore (a small hole with a roughly 1 nm internal diameter), located in a graphene nanoribbon (GNR). A critical feature of the new paradigm is that graphene's electrical properties allow the layer to be tuned in several distinct ways – namely, altering the shape of its edge, carrier concentration and nanopore location – thereby modulating both electrical conductance and external charge sensitivity. The researchers found that their novel technique can detect the DNA strand's rotational and positional conformation, and demonstrated that a graphene membrane with quantum point contact geometry exhibits greater electrical sensitivity than on with so-called uniform armchair geometry. The team has proposed a graphene-based field-effect transistor-like device for DNA sensing.

 

Prof. Jean-Pierre Leburton briefed Phys.org on the research he and his colleagues – Anuj Girdhar, Chaitanya Sathe and Klaus Schulten – conducted. "Simulations are presently leading experimental efforts on this specific topic – but transport models based on density functional theory cannot handle a large number of atoms due to limited computational resources," Leburton tells Phys.org, recounting some of the challenges the scientists faced. Density functional theory, or DFT, is a quantum mechanical modeling method used in physics and chemistry to investigate the electronic structure of many-body systems.

 

"In addition," Leburton continues, "these models are restricted to solid-state systems, while we're dealing with a hybrid solid-liquid system. For this reason, very simplistic and idealistic physical conditions are assumed on graphene nanoribbons." Such assumptions include uniform GNR widths with perfect armchair or zigzag edges, the nanopore being placed in the center of the graphene nanoribbon, and an absence of electrostatic perturbations from either the electrolytic solution or the dielectric supporting the graphene nanoribbon."In our approach, we use a multiorbital tight-binding (TB) technique that can handle a much larger number of atoms than DFT to account for the non-uniform GNR width, its irregular edges, and various sizes and positions of the nanopore," Leburton explains. The TB technique uses a superposition of wave functions of isolated atoms located at each atomic site to calculate the electronic band structure of solids.

 

"The electronic spectrum obtained from the tight binding model is then fed into a transport model based on a non-equilibrium Green function technique to compute the electrical conductance in general GNR configurations." A non-equilibrium Green (aka Green's) function, or NEGF, can be used to solve an inhomogeneous differential equation with boundary conditions in a way that is roughly analogous to the use of Fourier series in the solution of ordinary differential equations. Over the last decade, NEGF techniques have become widely used in corporate, engineering, government, and academic laboratories for modeling high-bias, quantum electron and hole transport in a wide variety of materials and devices.


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The Monkey and the Mask: Terrifying Portraits of Indonesia’s Street-Performing Macaques | LightBox | TIME.com

The Monkey and the Mask: Terrifying Portraits of Indonesia’s Street-Performing Macaques | LightBox | TIME.com | Psychology and matter | Scoop.it
Terror often stems not from the unknown, but from something familiar that has been subtly -- but unmistakably -- transformed. This certainly helps explain why Finnish photographer Perttu Saksa's series of masked and chained monkeys is so unsettling.

Via Stephanie Lay
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Stephanie Lay's curator insight, October 31, 2013 12:14 PM

I feel a little uncomfortable sharing this as an example of the uncanny valley because I don't want to diminish how awful it is that these creatures are being mis-treated - but they are, without a  doubt both humanlike and terribly unsettling so as an example of the form, worth sharing. 

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Swapping the faces of children with their dolls creates an unspeakable horror

Swapping the faces of children with their dolls creates an unspeakable horror | Psychology and matter | Scoop.it

Swapping the faces of children with their dolls creates an unspeakable horror


Via Stephanie Lay
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Stephanie Lay's curator insight, August 26, 2013 11:35 AM

A purer example of genuine uncanniness would be hard to find... 

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Eyeball removal tool

Eyeball removal tool | Psychology and matter | Scoop.it
So this is apparently real (?!): an eyeball removal tool for "Reborn" baby-dolls. Holy creepy.

BEST REBORN EYEBALL-REMOVING TOOL I'VE FOUND!

Via Stephanie Lay
EarthquakeMachine's insight:

Uncanny valley, so amazing

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Stephanie Lay's curator insight, November 13, 2014 7:37 AM

That's definitely on the ghastly side of uncanny! 

Artur Coelho's curator insight, November 13, 2014 10:20 AM

ah. modernismos. 

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Mechanical Turk: The New Face of Behavioral Science?

Mechanical Turk: The New Face of Behavioral Science? | Psychology and matter | Scoop.it
Mechanical Turk lets you pay people small amounts to complete "microtasks". Now, academics are using it to make their research faster, cheaper and -- arguably -- more accurate.
EarthquakeMachine's insight:

I love it

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Mechanical Turk: The New Face of Behavioral Science?

Mechanical Turk: The New Face of Behavioral Science? | Psychology and matter | Scoop.it
Mechanical Turk lets you pay people small amounts to complete "microtasks". Now, academics are using it to make their research faster, cheaper and -- arguably -- more accurate.
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We can restore cognition by manipulating where the body meets the mind - PsyPost

We can restore cognition by manipulating where the body meets the mind - PsyPost | Psychology and matter | Scoop.it
By Michal Schwartz, Weizmann Institute of Science; Aleksandra Deczkowska, Weizmann Institute of Science, and Kuti Baruch, Weizmann Institute of Science Whe
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Acting Techniques: Facial Expressions in Acting

Acting Techniques: Facial Expressions in Acting | Psychology and matter | Scoop.it
EarthquakeMachine's insight:

going in the opposite way...

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» Blog Archive » Creating Believable Characters – With the Enneagram

» Blog Archive » Creating Believable Characters – With the Enneagram | Psychology and matter | Scoop.it
EarthquakeMachine's insight:

...for writing rookies and for wannabies (ehem!)

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Lavater's Physiognomy: a Taxonomy For Endorsers in Print Advertisements by Gianluigi Guido

Lavater's Physiognomy: a Taxonomy For Endorsers in Print Advertisements by Gianluigi Guido | Psychology and matter | Scoop.it
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Percentages each Enneatype (or Myers-Briggs indicator)?

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Is the distribution of personalities equally homogeneous as biological-physiological types?.. I found this

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The 16 Personality Types

The 16 Personality Types | Psychology and matter | Scoop.it
To truly understand how your mind works you must not focus on the description of the personality types, instead try and determine how you process information a…
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