Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

Home > Press > UV-sensors from the oven: cientists at Kiel University revolutionize the nanostructure production process

Schematic represenation of zinc oxide nanostructures, which were produced by burner-flame transport synthesis, bridging two contacts.
Photo/Copyright: Mishra/Advanced Materials
Schematic represenation of zinc oxide nanostructures, which were produced by burner-flame transport synthesis, bridging two contacts.

Photo/Copyright: Mishra/Advanced Materials

Abstract:
Placed in fire detectors and water treatment units UV-sensors can save lives; also in many areas of industry and environment the demand for these devices is rising steadily. Scientists of Kiel University have been able to "bake" nanostructures within seconds, in order to fabricate very fast UV-sensors. This new technique totally diminishes the need to use sophisticated equipments and toxic chemicals. It will therefore be highly interesting for companies. The scientists have published their results today (November 19) in Advanced Materials, a very renowned scientific magazine.

UV-sensors from the oven: cientists at Kiel University revolutionize the nanostructure production process

Kiel, Germany | Posted on November 20th, 2013

When building a sensor device from nanostructures, one of the biggest challenges is how to interconnect them into electrical contacts in chips because of their extremely small dimensions in nanoscale range, says Dawit Gedamu, the first author of the paper. Most of the existing synthesis methods, such as Chemical Vapour Deposition or Vapor-Liquid-Solid (VLS) growth allow synthesis of different nanostructures only under specific conditions. For instance, the presence of catalytic particles, particular substrates, complex temperature, atmospheric conditions and many more factors must be met. Furthermore, to integrate the synthesized nanostructures with these techniques in the chips requires another very sophisticated step. There are silicon or gallium nitride based UV detectors already available in the market but they lack a certain level of selectivity and also they cannot function in harsh environments. High production costs, multistep processes and the requirement of specific operating conditions limit the field of application for these sensors.

"Extremely promising" for various applications are the sensors that are based on zinc oxide, says Dr. Yogendra Kumar Mishra, scientific assistant with the work group "Functional Nanomaterials" at Kiel University and main author of the study. "Nanostructures made from zinc oxide are highly interesting for multifunctional applications, due to their sensibility to UV light and their electrical and mechanical properties", says Mishra. Also, the material is relatively inexpensive and easy to synthesize. Since up to a certain level zinc is necessary for human organisms, these zinc oxide nano-microstructures could be of potential interest for biomedical engineering.

The scientists have fabricated a network of interconnected zinc oxide nano-tetrapods as a bridge between electrodes on a chip by a new single step flame transport synthesis process: In a simple oven or airbrush gun-type burner it only needs high temperature to convert zinc microparticles into nano-micro tetrapods. This process takes place in normal air environment and the necessary amount of oxygen is regulated by the flame itself. "This burner-flame transport synthesis method allows us to grow the zinc oxide nano-microstructures directly on the chip - and that only takes a few seconds, it is just a matter of driving the chip through the flame while the nano tetrapods assemble themselves onto it!" Mishra is excited to report. The high temperature of the flame ensures contacts of good quality between chip and the nanostructures, which is highly desirable for a better performance of the device.

The result: the sensor produced by the Kiel University scientists reacts to UV light within milliseconds of its exposure. Additionally, it also works in rather rough environments. These simple and inexpensive manufacturing conditions as well as the usage of pure zinc microparticles make this production method at the laboratories at Kiel University highly attractive for manufacturing companies. "We already had regional companies inquiring about our work. It shows that our basic research can be transferred into concrete applications", Professor Rainer Adelung, head of the research team, explains. The next logical step for the material scientists is therefore to find the ways to produce these nano-tetrapods on a larger scale.

One curious fact: Zinc oxide nanostructures started their career as waste from conventional VLS growth experiments for zinc oxide. One day, Yogendra Mishra examined the crystals that looked like artificial snow under the microscope: "Their particular intertwining structure and their ability to detect light implied an enormous potential", says the scientist, who was holding a fellowship from the Alexander von Humboldt Foundation while developing the new method in the years following this discovery. To successfully produce the nano-tetrapods, the right combination of temperature and mixing ratio of zinc particles and sacrificial polymer as well as other parameters had to be investigated.

Nano science is strong at Kiel University. Two big Collaborative Research Centres (CRC) provided Mishra with necessary resources and expertise. There, almost 200 scientists work meticulously on molecules, which can be switched on and off by light in order to take over certain functions (CRC 677 "Function by Switching"), and on new materials, which are capable of measuring tiny magnetic fields in the human brain and heart (CRC 855 "Magnetoelectric Composites - Future Biomagnetic Interfaces"). Developing new diagnostic methods and devices is their goal. The German Research Foundation (DFG) supports their research.

Full bibliographic information

Rapid fabrication technique for interpenetrated ZnO nanotetrapod networks for fast UV-sensors; Dawit Gedamu, Ingo Paulowicz, Sören Kaps, Oleg Lupan, Sebastian Wille, Galina Haidarschin, Yogendra Kumar Mishra, Rainer Adelung; Advanced Materials; DOI: 10.1002/adma.201304363

####

About Christian-Albrechts-Universitaet zu Kiel
When Duke Christian Albrecht of Holstein-Gottorp decided to found a university in 1665, the Thirty Years' War was over. The State required well-educated young men for service to government, who were to graduate from the new university. 140 students enrolled in the initially established faculties of Theology, Law, Medicine and Philosophy.

The University currently teaches over 24,000 women and men and the range of subjects on offer is spread over eight faculties. In addition to the original faculties, the faculties of Agricultural and Nutritional Science, Mathematics and Natural Sciences, Business, Economics and Social Sciences and, the newest faculty, the Faculty of Engineering are integrated into the university. Where once Max Planck and Heinrich Hertz worked, around 700 academics now pass on their knowledge to students from Germany and across the Globe.

For more information, please click here

Contacts:
Dr. Yogendra Kumar Mishra
Funktionale Nanomaterialien
Institut für Materialwissenschaft
Christian-Albrechts-Universität zu Kiel
Tel.: +40 (0)431/880 6195


Prof. Dr. Rainer Adelung
Funktionale Nanomaterialien
Institut für Materialwissenschaft
Christian-Albrechts-Universität zu Kiel
Tel.: +49 (0)431/880 6116


Christian-Albrechts-Universität zu Kiel
Press
communication and marketing
Dr. Boris Pawlowski
text: Denis Schimmelpfennig
translation: Ann-Christin Wimber
Address: D-24098 Kiel
telephone: +49 (0)431 880-2104
fax: +49 (0)431 880-1355

Copyright © AlphaGalileo

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

News and information

Leti Announces Launch of First European Nanomedicine Characterisation Laboratory: Project Combines Expertise of 9 Partners in 8 Countries to Foster Nanomedicine Innovation and Facilitate Regulatory Approval July 1st, 2015

Bruker Introduces Second-Generation Inspire Nanochemical Imaging Solution: Featuring Unique PeakForce IR and IR EasyAlign Technology July 1st, 2015

GLOBALFOUNDRIES Completes Acquisition of IBM Microelectronics Business: Transaction adds differentiating technologies, world-class technologists, and intellectual property July 1st, 2015

Samsung's New Graphene Technology Will Double Life Of Your Lithium-Ion Battery July 1st, 2015

Govt.-Legislation/Regulation/Funding/Policy

Influential Interfaces Lead to Advances in Organic Spintronics July 1st, 2015

NIST ‘How-To’ Website Documents Procedures for Nano-EHS Research and Testing July 1st, 2015

Ultra-stable JILA microscopy technique tracks tiny objects for hours July 1st, 2015

Proposed TSCA Nanomaterial Rule ‘Premature’, Says Former EPA Toxicologist July 1st, 2015

Sensors

Carnegie Mellon chemists characterize 3-D macroporous hydrogels: Methods will allow researchers to develop new 'smart' materials June 30th, 2015

Visible Light-Sensitive Photocatalysts Used for Purification of Contaminated Water in Iran June 30th, 2015

Graphene breakthrough as Bosch creates magnetic sensor 100 times more sensitive than silicon equivalent June 28th, 2015

The peaks and valleys of silicon: Team of USC Viterbi School of Engineering Researchers introduce new layered semiconducting materials as silicon alternative June 27th, 2015

Discoveries

Influential Interfaces Lead to Advances in Organic Spintronics July 1st, 2015

Ultra-stable JILA microscopy technique tracks tiny objects for hours July 1st, 2015

Emergence of a 'devil's staircase' in a spin-valve system July 1st, 2015

Measurement of Tiny Amounts of Heavy Metals in Baby Food Samples July 1st, 2015

Announcements

Leti Announces Launch of First European Nanomedicine Characterisation Laboratory: Project Combines Expertise of 9 Partners in 8 Countries to Foster Nanomedicine Innovation and Facilitate Regulatory Approval July 1st, 2015

Bruker Introduces Second-Generation Inspire Nanochemical Imaging Solution: Featuring Unique PeakForce IR and IR EasyAlign Technology July 1st, 2015

GLOBALFOUNDRIES Completes Acquisition of IBM Microelectronics Business: Transaction adds differentiating technologies, world-class technologists, and intellectual property July 1st, 2015

Samsung's New Graphene Technology Will Double Life Of Your Lithium-Ion Battery July 1st, 2015

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers

Influential Interfaces Lead to Advances in Organic Spintronics July 1st, 2015

Emergence of a 'devil's staircase' in a spin-valve system July 1st, 2015

Samsung's New Graphene Technology Will Double Life Of Your Lithium-Ion Battery July 1st, 2015

Measurement of Tiny Amounts of Heavy Metals in Baby Food Samples July 1st, 2015

Water

Visible Light-Sensitive Photocatalysts Used for Purification of Contaminated Water in Iran June 30th, 2015

Dais Analytic Unveils New Version of Aqualyte Membrane Technology: Updates to the Basis of the Company's Industry-Changing Nanotechnology Designed to Strengthen Position in Global Air, Energy, and Water Markets June 26th, 2015

Bacteria Cellulose, Natural Polymers with Applications in Various Industries Synthesized in Iran June 22nd, 2015

Ceramic Nanomembrane, New Material for Dehydration of Natural Gas June 7th, 2015

Industrial

Green Chemistry Methods Used in Iran to Produce Zinc Oxide Nanoparticles June 27th, 2015

Stanford researchers stretch a thin crystal to get better solar cells June 25th, 2015

Silica 'spiky screws' could enhance industrial coatings, additive manufacturing June 24th, 2015

Research findings point way to designing crack-resistant metals June 24th, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More










ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project