Navigation Links
Empa grows 'sea urchin'-shaped structures
Date:7/29/2010

Processes which lend materials new characteristics are generally complicated and therefore often rather difficult to reproduce. So surprise turns to astonishment when scientists report on new methods which not only produce outstanding results despite the fact that they use economically priced starting materials but also do not need expensive instrumentation.

Just a simple framework made of polystyrene

This is exactly what Jamil Elias and Laetitia Philippe of Empa's Mechanics of Materials and Nanostructures Laboratory in Thun have succeeded in doing. They used polystyrene spheres as a sort of scaffolding to create three-dimensional nanostructures of semiconducting zinc oxide on various substrates. The two scientists are convinced that the (nanostructured) rough but regularly-structured surfaces they have produced this way can be exploited in a range of electronic and optoelectronic devices such as solar cells and also short wave lasers, light emitting diodes and field emission displays.

The scientific world reacted promptly. The paper in which the results were reported was published in January 2010 in the on line edition of Advanced Materials. In the same month it became the most frequently downloaded article, and in April it was selected to appear on the Inside Front Cover of the journal.

The principle behind the process is quite simple. Little spheres of polystyrene a few micrometers in diameter are placed on an electrically conducting surface where they orient themselves in regular patterns. Polystyrene is cheap and ubiquitous it is widely used as a packaging material (for example for plastic yoghurt pots) or as insulating material in expanded form as a solidified foam.

Hollow bodies with prickles for photovoltaic applications

The tiny balls of polystyrene anchored in this way form the template on which the nanowires are desposited. Jamil Elias has succeeded in using an electrochemical method which himself has developed to vary the conductivity and electrolytic properties of the polystyrene balls in such way that the zinc oxide is deposited on the surface of the microspheres. Over time regular nanowires grow from this surface, and when this process is complete the polystyrene is removed, leaving behind hollow spherical structures with spines little sea-urchins, as it were! Tightly packed on the underlying substrate, the sea-urchins lend it a three-dimensional structure, thereby increasing considerably its surface area.

This nanostructured surface is predestined for use in photovoltaic applications. The researchers expect that it will have excellent light scattering properties. This means the surface will be able to absorb significantly more sunlight and therefore be able to convert radiated energy into electricity more efficiently. In a project supported by the Swiss Federal Office of Energy (SFOE), Laetitia Philippe and her research team are developing extremely thin absorbers (ETAs) for solar cells, based these zinc oxide nanostructures.


'/>"/>

Contact: Dr. Jamil Elias
jamil.elias@empa.ch
41-332-283-627
Swiss Federal Laboratories for Materials Science and Technology (EMPA)
Source:Eurekalert  

Related biology technology :

1. Dramatic changes in agriculture needed as world warms and grows, researchers say
2. Nations Largest Network of Doctors Specializing in Bioidentical Hormones Grows at an Exponential Rate
3. The MedZilla Report for October 2009 - Health Care Employment Grows Again in October Even As Clinics, Specialty Centers Close
4. The MedZilla Report for September 2009 - Care Grows Again in September and - Surprisingly - Pharma Sales Jobs Up Too
5. Impact of Open Source Software on Clinical Trials Grows With Release of OpenClinica 3.0 Electronic Data Capture Software
6. The MedZilla Report for August 2009 -- Health Care Grows Another 28,000 While Hospitals And Insurers Feel Painful Pinch
7. Video shows nanotube spins as it grows
8. Depth charge: Using atomic force microscopy to study subsurface structures
9. Biomedical Structures Receives Growth Capital from Ampersand Ventures to Fund Ongoing Expansion
10. Light twists rigid structures in unexpected nanotech finding
11. Using magnetic toys as inspiration, researchers tease out structures of self-assembled clusters
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Empa grows 'sea urchin'-shaped structures
(Date:6/27/2016)... ... June 27, 2016 , ... Cancer experts from ... believe could be a new and helpful biomarker for malignant pleural mesothelioma. Surviving ... to read it now. , Biomarkers are components in the blood, tissue ...
(Date:6/27/2016)... ... June 27, 2016 , ... Newly ... technologies, services and solutions to the healthcare market. The company's primary focus is ... manufacturing, sales and marketing strategies that are necessary to help companies efficiently bring ...
(Date:6/27/2016)... PHILADELPHIA , June 27, 2016  Liquid ... today announced the funding of a Sponsored Research ... study circulating tumor cells (CTCs) from cancer patients.  ... changes in CTC levels correlate with clinical outcomes ... therapies. These data will then be employed to ...
(Date:6/24/2016)... on a range of subjects including policies, debt and investment ... Speaking at a lecture to the Canadian Economics ... the country,s inflation target, which is set by both the ... "In certain areas there needs to be frequent ... not sit down and address strategy together?" He ...
Breaking Biology Technology:
(Date:6/2/2016)... 2016   The Weather Company , an IBM Business ... industry-first capability in which consumers will be able to interact ... questions via voice or text and receive relevant information about ... Marketers have long sought an advertising solution that can ... personal, relevant and valuable; and can scale across millions of ...
(Date:5/16/2016)... May 16, 2016   EyeLock LLC , a ... the opening of an IoT Center of Excellence in ... expand the development of embedded iris biometric applications. ... of convenience and security with unmatched biometric accuracy, making ... aside from DNA. EyeLock,s platform uses video technology to ...
(Date:4/28/2016)... GOTHENBURG, Sweden , April 28, 2016 ... 1,491.2 M (139.9), up 966% compared with the first quarter of ... Operating profit totaled SEK 589.1 M (loss: 18.8) and the operating ... SEK 7.12 (loss: 0.32) Cash flow from operations was ... , The 2016 revenue guidance is unchanged, SEK 7,000-8,500 M. ...
Breaking Biology News(10 mins):