Contact Information:
Dr. Jonathan Agbenyega
ja@iucr.org
44-124-434-2878
International Union of Crystallography



Kredyty mieszkaniowe Kredyty mieszkaniowe

Sprawdź aktualny ranking najlepszych kredytów mieszkaniowych w Polsce - atrakcyjne kredytowanie nieruchomości.

PRESS-NEWS.org - Press Release Distribution
FREE PRESS RELEASES DISTRIBUTION
RSS - Press News Release
Add Press Release

Nanosheets and nanowires


Nanosheets and nanowires
2014-04-01
(Press-News.org) Researchers in China, [J. Appl. Cryst. (2014). 47, 527-531] have found a convenient way to selectively prepare germanium sulfide nanostructures, including nanosheets and nanowires, that are more active than their bulk counterparts and could open the way to lower cost and safer optoelectronics, solar energy conversion and faster computer circuitry.

Germanium monosulfide, GeS, is emerging as one of the most important "IV–VI" semiconductor materials with potential in opto-electronics applications for telecommunications and computing, and as an absorber of light for use in solar energy conversion. One important property is its much lower toxicity and environmental impact when compared to other semiconductors made with cadmium, lead and mercury. It is less costly than other materials made with rare and noble metal elements. Indeed, glassy GeS has been used in lasers, fibre optic devices and infrared lenses as well as rewritable optical discs and non-volatile memory devices for several years. It is also used extensively as a solid electrolyte in conductive bridging random access memory (RAM) devices.

The repertoire of this material might be extended much further with the extra control that its use as nanostructured systems might allow. Liang Shi and Yumei Dai of the University of Science and Technology of China, in Hefei, point out that research in this area has lagged behind that with other IV-VI semiconductors. They hope to change that and have focused on how nanosheets and nanowires of GeS might be readily formed. They have used X-ray powder diffraction, transmission electron microscopy, energy-dispersive X-ray spectrometry and scanning electron microscopy to investigate the structure, morphology, composition and optical absorption properties of their samples.

The team used simple "wet" chemistry to synthesis their products using germanium dichloride-dioxane complex, thiourea and oleylamine (OLA) as starting materials. The ingredients were mixed in a sealed reaction flask, blasted with ultrasound to exclude air and then stirred and heated. The team was able to make nanosheets of GeS this way if the process was carried out for several hours at 593 Kelvin. At higher temperature, 613 Kelvin, they found that the sheets wind up into nanowires. Indeed, the precise heating time and temperature allowed them to control the structure of the final product. The team suggests that the rolling up of the nanosheets into nanowires is driven by the surface tension between the sheet and the OLA molecules during the heating.

Having proven the structural integrity of their GeS nanowires and nanosheets, the team built several test devices - a photoresponsive unit - which they used to evaluate the optical and electronic properties of the products. The team says that they have demonstrated "outstanding photoresponsive behaviour". This "indicates the potential use of as-synthesized GeS nanosheets and nanowires in solar energy conversion systems, such as the fabrication of photovoltaic devices".

INFORMATION: For more information please contact Dr Jonathan Agbenyega
Business Development Manager, IUCr
00 +44 (0) 1244 342878
ja@iucr.org About the IUCr The IUCr is a scientific union adhering to the International Council for Science (ICSU). Its objectives are to promote international cooperation in crystallography and to contribute to all aspects of crystallography, to promote international publication of crystallographic research, to facilitate standardization of methods, units, nomenclatures and symbols, and to form a focus for the relations of crystallography to other sciences. The IUCr fulfils these objectives by publishing in print and electronically primary scientific journals through Crystallography Journals Online, the series of reference volumes International Tables for Crystallography, distributing the quarterly IUCr Newsletter, maintaining the online World Directory/Database of Crystallographers, awarding the Ewald Prize and organising the triennial Congress and General Assembly. END

[Attachments] See images for this press release:
Nanosheets and nanowires

ELSE PRESS RELEASES FROM THIS DATE:

New discovery gives hope that nerves could be repaired after spinal cord injury

2014-04-01
A new discovery suggests it could one day be possible to chemically reprogram and repair damaged nerves after spinal cord injury or brain trauma. Researchers from Imperial College London and the Hertie Institute, University of Tuebingen have identified a possible mechanism for re-growing damaged nerve fibres in the central nervous system (CNS). This damage is currently irreparable, often leaving those who suffer spinal cord injury, stroke or brain trauma with serious impairments like loss of sensation and permanent paralysis. Published in Nature Communications today, ...

Neuromonitoring with pulse-train stimulation for implantation of thoracic pedicle screws

2014-04-01
Charlottesville, VA (April 1, 2014). Researchers from Syracuse, New York, report a new, highly accurate, neuromonitoring method that can be used during thoracic spine surgery to prevent malpositioning of pedicle screws such that they enter the spinal canal and possibly cause postoperative neurological impairment. Findings of this prospective, blinded, and randomized study are reported and discussed in two companion papers published today online, ahead of print, in the Journal of Neurosurgery: Spine, specifically "Neuromonitoring with pulse-train stimulation for implantation ...

Child support in Tennessee paternity actions

2014-04-01
Child support in Tennessee paternity actions Article provided by Autry L. Jones, Attorney at Law Visit us at http://www.autryjones.com Tennessee law recognizes that both parents have legal duties to financially support their child, so when two parents do not live together, the law allows a Tennessee court to order child support. Child support arrangements usually involve one parent -- the one with whom the child does not live (or lives less) --paying money monthly to the custodial parent to help with the child's living expenses. While people think of child support ...

Medical marijuana bill progresses through Florida legislature

2014-04-01
Medical marijuana bill progresses through Florida legislature Article provided by Stanley E. Peacock, P.A. Visit us at http://www.stanpeacocklaw.com While a handful states have already decriminalized the recreational use of marijuana, others are still debating whether to approve the drug for medical purposes, including Florida. However, if one particular piece of Florida legislation eventually becomes law, medical marijuana may become a reality in the Sunshine State. Recently, House Bill 843 passed a Florida House Appropriations Committee by a vote of 24-0; meaning ...

Special rules for workers over age 50 who apply for disability benefits

2014-04-01
Special rules for workers over age 50 who apply for disability benefits Article provided by Law Offices of Judith S. Leland, APLC Visit us at http://www.disabilitylawfirm.com According to the Social Security Administration, more than 25 percent of today's 20-year-olds will be put out of work by a disabling condition before reaching the age of 67. A disability becomes more likely as workers age and their bodies become less resistant to injury and illness. Fortunately, for qualifying disabled workers who have paid enough into the system, compensation may be available ...

Male military spouses more likely to face divorce, but may lack support

2014-04-01
Male military spouses more likely to face divorce, but may lack support Article provided by Anthony C. Williams & Associates, PC Visit us at http://www.anthonywilliamslaw.com Today, women account for 15 percent of active duty U.S. military personnel. Married female armed service members are far more likely to divorce than their male counterparts. According to the Defense Department, the overall divorce rate in the military among both men and women was 3.4 percent in fiscal year 2013. But, 7.2 percent of women in the military reported a divorce during fiscal year ...

Norman Dovichi of Notre Dame to speak at Bioanalytical Sensors Mtg, May 22-23, 2014, Cambridge, MA.

2014-04-01
Norman Dovichi, Grace-Rupley Professor at the University of Notre Dame, to give a presentation titled "Zone Electrophoresis-Mass Spectrometry at the zeptomole level," at the Inaugural Bioanalytical Sensors Conference, May 22 & 23, 2014 in Cambridge, MA. Norman Dovichi received his BSc degree in Chemistry and Applied Mathematics from Northern Illinois University and his PhD in Analytical Chemistry from the University of Utah. He played a pioneering role in single molecule detection by laser-induced fluorescence. That experience led to the development of a high-throughput ...

Warriors Crowned CIHL Champions with RBC Asia Cup Victory

2014-04-01
The AsiaXPAT Kowloon Warriors have won their second CIHL championship title, with a 6-5 victory over the RBC South China Sharks in the final game of the 2013-2014 season. The Warriors, who entered the playoffs in last place but on a five-game winning streak, hoisted the RBC Asia Cup as the team became the first team to win two CIHL titles in Hong Kong's first full-contact elite ice hockey league. With the Warriors, who also won the title in the 2011-2012 season, facing off against the Sharks, the 2012-2013 champions, it was sure to be a thrilling game at Mega Ice in ...

Calvert Holdings, Inc. Announces Executive Management Changes

2014-04-01
Calvert Holdings, Inc. announced that Michael A. Recny, Ph.D., has been appointed Chief Executive Officer and has been elected a Director of the Company. He replaces Russ McLauchlan, who will become Executive Chairman and who will also now head the newly formed Executive Committee of Calvert Holdings, which will include Dr. Recny, Allan Reiss, President of Calvert Holdings, Inc., and Charles Spainhour, DVM, Ph.D, the Company's Chief Scientific Officer. Dr. Recny will also continue to serve as President of Calvert Research, LLC, which is the investment arm of Calvert Holdings. Of ...

National Love Our Children Day is Saturday, April 5th

2014-04-01
Love Our Children USA announces the 11th annual National Love Our Children Day. National Love Our Children Day is an initiative of Love Our Children USA, and is celebrated annually across the country on the first Saturday of every April to honor children, strengthen families and raise awareness for efforts to protect children. National Love Our Children Day is like Mother's and Father's Day for children. This special day was created to acknowledge the value of children and to educate parents on the importance of giving them love, protection and respect, the three essential ...

LAST 30 PRESS RELEASES:

How your brain decides blame and punishment -- and how it can be changed

Uniquely human brain region enables punishment decisions

Pinpointing punishment

Chapman University publishes research on attractiveness and mating

E-cigarettes: Special issue from Nicotine & Tobacco Research

Placental problems in early pregnancy associated with 5-fold increased risk of OB & fetal disorders

UT study: Invasive brood parasites a threat to native bird species

Criminals acquire guns through social connections

Restoring ocean health

Report: Cancer remains leading cause of death in US Hispanics

Twin study suggests genetic factors contribute to insomnia in adults

To be fragrant or not: Why do some male hairstreak butterflies lack scent organs?

International team discovers natural defense against HIV

Bolivian biodiversity observatory takes its first steps

Choice of college major influences lifetime earnings more than simply getting a degree

Dominant strain of drug-resistant MRSA decreases in hospitals, but persists in community

Synthetic biology needs robust safety mechanisms before real world application

US defense agencies increase investment in federal synthetic biology research

Robots help to map England's only deep-water Marine Conservation Zone

Mayo researchers identify protein -- may predict who will respond to PD-1 immunotherapy for melanoma

How much water do US fracking operations really use?

New approach to mammograms could improve reliability

The influence of citizen science grows despite some resistance

Unlocking secrets of how fossils form

What happens on the molecular level when smog gets into the lungs?

Using ultrasound to clean medical instruments

Platinum and iron oxide working together get the job done

Tiny silica particles could be used to repair damaged teeth, research shows

A quantum lab for everyone

No way? Charity's logo may influence perception of food in package

[Press-News.org] Nanosheets and nanowires
Press-News.org is a service of DragonFly Company. All Rights Reserved.
Issuers of news releases are solely responsible for the accuracy of their content.