Featured Research

from universities, journals, and other organizations

Graphene: A patterned template for molecular packing

Date:
October 11, 2012
Source:
The Agency for Science, Technology and Research (A*STAR)
Summary:
Simulations of atomic-scale processes show how to trap and pack molecules in patterned graphene sheets that may have molecular storage applications.

Simulations of atomic-scale processes show how to trap and pack molecules in patterned graphene sheets that may have molecular storage applications.

Graphene's versatile electronic, chemical and mechanical properties have placed it center stage in physical sciences research, with attention currently focused on its potential applications. Computational experts are contributing unique insights by investigating graphene-based structures in silico. By exploring the structure and properties of graphone -- graphene that is hydrogenated on one side -- a research team from Singapore and the USA has provided a potential template for packing molecules. These structures could be useful for trapping molecules for energy storage or biological applications.

Led by Chilla Damodara Reddy of the A*STAR Institute of High Performance Computing, Singapore, the research team computationally constructed a large square graphene sheet with hydrogen atoms covalently bonded above every other carbon atom to form a graphone domain. Depending on the size of the domain, the graphone regions distorted into three distinct three-dimensional architectures. Small domains morphed into a cap shape, while larger domains resulted in interfacing graphene and graphone segments curving in opposite directions with the center of the graphone patch remaining flat. A third, intermediate, morphology showed undulations both at the graphone/graphene interface and in the center of the hydrogenated graphone. A 5% lattice mismatch between graphene and graphone caused the three-dimensional distortions.

All of the structures were stable well above room temperature. Reddy and co-workers also observed so-called 'energy wells' in the graphone domains, which they tested to determine whether or not they could trap molecules. They used fullerenes as their model molecules.

The researchers designed materials with graphone domains a suitable distance apart and of appropriate diameter to optimize the trapping of multiple molecules within the energy wells. They also proposed a minimum spacing between the domains to prevent instability between trapped molecules of neighboring domains.

Reddy and his co-workers extended the work to explore the possibility of trapping multiple fullerenes within one graphone domain. They showed that a domain with a diameter of 2 nanometers could trap three fullerenes in a triangular array, while one with a diameter of 4 nanometers could trap twelve molecules in different undulations of the graphone domain (see image). These structures were also stable at room temperature; although at very high temperatures -- above 700 kelvin -- the molecules could escape the confines of the energy well.

"Our graphene-based structures provide a potential template for packing other molecules, such as hydrogen and methanol molecules, which could be used in energy applications," say the researchers. They could also trap proteins and DNA for use in biological applications.


Story Source:

The above story is based on materials provided by The Agency for Science, Technology and Research (A*STAR). Note: Materials may be edited for content and length.


Journal Reference:

  1. C D Reddy, Y W Zhang, V B Shenoy. Patterned graphone—a novel template for molecular packing. Nanotechnology, 2012; 23 (16): 165303 DOI: 10.1088/0957-4484/23/16/165303

Cite This Page:

The Agency for Science, Technology and Research (A*STAR). "Graphene: A patterned template for molecular packing." ScienceDaily. ScienceDaily, 11 October 2012. <www.sciencedaily.com/releases/2012/10/121011083705.htm>.
The Agency for Science, Technology and Research (A*STAR). (2012, October 11). Graphene: A patterned template for molecular packing. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2012/10/121011083705.htm
The Agency for Science, Technology and Research (A*STAR). "Graphene: A patterned template for molecular packing." ScienceDaily. www.sciencedaily.com/releases/2012/10/121011083705.htm (accessed July 28, 2014).

Share This




More Matter & Energy News

Monday, July 28, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Europe's Highest Train Turns 80 in French Pyrenees

Europe's Highest Train Turns 80 in French Pyrenees

AFP (July 25, 2014) Europe's highest train, the little train of Artouste in the French Pyrenees, celebrates its 80th birthday. Duration: 01:05 Video provided by AFP
Powered by NewsLook.com
TSA Administrator on Politics and Flight Bans

TSA Administrator on Politics and Flight Bans

AP (July 24, 2014) TSA administrator, John Pistole's took part in the Aspen Security Forum 2014, where he answered questions on lifting of the ban on flights into Israel's Tel Aviv airport and whether politics played a role in lifting the ban. (July 24) Video provided by AP
Powered by NewsLook.com
Creative Makeovers for Ugly Cellphone Towers

Creative Makeovers for Ugly Cellphone Towers

AP (July 24, 2014) Mobile phone companies and communities across the country are going to new lengths to disguise those unsightly cellphone towers. From a church bell tower to a flagpole, even a pencil, some towers are trying to make a point. (July 24) Video provided by AP
Powered by NewsLook.com
Algonquin Power Goes Activist on Its Target Gas Natural

Algonquin Power Goes Activist on Its Target Gas Natural

TheStreet (July 23, 2014) When The Deal's Amanda Levin exclusively reported that Gas Natural had been talking to potential suitors, the Ohio company responded with a flat denial, claiming its board had not talked to anyone about a possible sale. Lo and behold, Canadian utility Algonquin Power and Utilities not only had approached the company, but it did it three times. Its last offer was for $13 per share as Gas Natural's was trading at a 60-day moving average of about $12.50 per share. Now Algonquin, which has a 4.9% stake in Gas Natural, has taken its case to shareholders, calling on them to back its proposals or, possibly, a change in the target's board. Video provided by TheStreet
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins