Navigation Links
Scientists solve mystery of colorful armchair nanotubes
Date:1/9/2012

Rice University researchers have figured out what gives armchair nanotubes their unique bright colors: hydrogen-like objects called excitons.

Their findings appear in the online edition of the Journal of the American Chemical Society.

Armchair carbon nanotubes so named for the "U"-shaped configuration of the atoms at their uncapped tips are one-dimensional metals and have no band gap. This means electrons flow from one end to the other with little resistivity, the very property that may someday make armchair quantum wires possible.

The Rice researchers show armchair nanotubes absorb light like semiconductors. An electron is promoted from an immobile state to a conducting state by absorbing photons and leaving behind a positively charged "hole," said Rice physicist Junichiro Kono. The new electron-hole pair forms an exciton, which has a neutral charge.

"The excitons are created by the absorption of a particular wavelength of light," said graduate student and lead author Erik Hroz. "What your eye sees is the light that's left over; the nanotubes take a portion of the visible spectrum out." The diameter of the nanotube determines which parts of the visible spectrum are absorbed; this absorption accounts for the rainbow of colors seen among different batches of nanotubes.

Scientists have realized that gold and silver nanoparticles could be manipulated to reflect brilliant hues a property that let artisans who had no notions of "nano" create stained glass windows for medieval cathedrals. Depending on their size, the particles absorbed and emitted light of particular colors due to a phenomenon known as plasma resonance.

In more recent times, researchers noticed semiconducting nanoparticles, also known as quantum dots, show colors determined by their size-dependent band gaps.

But plasma resonance happens at wavelengths outside the visible spectrum in metallic carbon nanotubes. And armchair nanot
'/>"/>

Contact: David Ruth
david@rice.edu
713-348-6327
Rice University
Source:Eurekalert

Page: 1 2 3

Related biology technology :

1. Nanowiggles: Scientists discover graphene nanomaterials with tunable functionality in electronics
2. Sheffield scientists shine a light on the detection of bacterial infection
3. Singapore scientists lead human embryonic stem cell study
4. Scientists defuse the Vietnam time bomb
5. Scientists carve nanowires out of ultrananocrystalline diamond thin films
6. Berkeley Lab scientists develop new tool for the study of spatial patterns in living cells
7. Shaken, not stirred: Berkeley lab scientists spy molecular maneuvers
8. Using new technique, scientists uncover a delicate magnetic balance for superconductivity
9. Scientists create computing building blocks from bacteria and DNA
10. Scientists determine alternative insecticide dramatically reduces malaria transmission
11. Scientists take up golf to prove long-standing theory of cell stickiness
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/15/2014)... METTLER TOLEDO is pleased to announce that the ... PVM technology , is now available. The new ... continuously captures high-resolution images under a wide range ... a report pairing the most relevant images to ... compelling blend of high resolution images and trend ...
(Date:12/15/2014)... COPENHAGEN, Denmark , Dec. 15, 2014 /PRNewswire/ ... its innovative TransCon technology to address significant unmet ... from its ongoing Phase 2 pediatric study to ... growth hormone deficiency, or GHD.  This interim analysis ... the anticipated total enrollment in the study, completing ...
(Date:12/13/2014)... Washington, USA, and TAICHUNG, Taiwan (PRWEB) December 12, 2014 ... rise, despite less rosy indicators in overall global economic ... society for optics and photonics , said in a ... International Conference) on 5 December at the National Chung ... solar energy, which is being integrated into future energy ...
(Date:12/13/2014)... DUBLIN , Dec. 11, 2014 Research ... announced the addition of the "Glucose Sensors: ... http://photos.prnewswire.com/prnh/20130307/600769 ... biocompatible product designs is giving hope for a ... Noninvasive glucose monitors that can measure glucose levels ...
Breaking Biology Technology:New Real-Time In Situ Probe-Based Video Microscope from METTLER TOLEDO 2Ascendis Pharma A/S Announces Positive Six-Month Interim Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 2Ascendis Pharma A/S Announces Positive Six-Month Interim Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 3Ascendis Pharma A/S Announces Positive Six-Month Interim Results from a Phase 2 Pediatric Study of Once-Weekly TransCon Growth Hormone for the Treatment of Growth Hormone Deficiency 4Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 2Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 3Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 4Photonics Continues Upward Trends Despite Challenges in the Global Economy, Notes SPIE CEO 5Glucose Sensors: the Next Generation 2Glucose Sensors: the Next Generation 3
... Calif., Aug. 30, 2011 ProteinSimple today introduced a revolutionary ...  The Simple Western is a complete reinvention of the Western ...  For the first time in 30 years, researchers have access ... The Western Blot was invented in 1979 and ...
... is crucial to preventing countless human diseases. In a ... discovered a new approach for studying molecules within their ... of how bacteria infect people. The research, led ... published in the Proceedings of the National Academy ...
... (ACerS) today announced the names of the organization,s two ... Koichi Niihari are the 2011 recipients of the Distinguished ... ACerS. The award is given in recognition of an ... "The Society,s Distinguished Life Member is presented annually ...
Cached Biology Technology:ProteinSimple Reinvents the Western Blot 2Scientists develop new technologies for understanding bacterial infections 2Scientists develop new technologies for understanding bacterial infections 3The American Ceramic Society selects Marshall, Niihara as 2011 Distinguish Life Members 2
(Date:12/10/2014)...     Jifflenow ...   Jifflenow, a leading provider ... business-to-business (B2B) events, today announced a partnership with ... communication (NFC), Bluetooth low energy (BLE), and cloud-based ... Jifflenow will integrate its meeting scheduling ...
(Date:12/3/2014)... 2014 As part of our commitment to ... pleased to announce the release of a new reader ... the workforce data that they need. The ... by existing readers. Many such devices have serious shortcomings ... technology. Older models force users to navigate numerous complicated ...
(Date:11/21/2014)... SAN JOSE, Calif. , Nov. 20, 2014 /PRNewswire/ ... a global leader in microcontroller (MCU) and touch technology ... digital temperature sensors with the widest V ... family delivers higher temperature accuracy and faster I 2 ... nonvolatile registers and serial EEPROM memory making them ideal ...
Breaking Biology News(10 mins):Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 2Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 3Inception Technologies to Release New Biometric Reader 2Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 2Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 3Atmel Launches Industry's First Wide-V(cc) Low-Power Temperature Sensor Family 4
... scientists have shown that chromosomal abnormalities are present in ... by young, fertile couples. Ms Evelyne Vanneste, a PhD ... University Fertility Center, Leuven University, Belgium, told the 25th ... and Embryology today (Wednesday July 1), that the surprising ...
... function declines as we get older. Moreover, recent studies have ... in during the course of our lives appears to influence ... Technische Universitt Berlin are studying how division of labour among ... they have found that, by switching their social role, aging ...
... batty over a new discovery which could lead to ... longer lifespans. The discovery, featured on the cover of ... Journal ( http://www.fasebj.org ), shows that proper protein ... live significantly longer than other mammals of comparable size, ...
Cached Biology News:Chromosomal problems affect nearly all human embryos 2Chromosomal problems affect nearly all human embryos 3A young brain for an old bee 2
, Premium quality synthesis and purification , You provide the sequence, we'll do the rest , Rigorous quality control , Your choice of purification method, amount and format , Available annealed...
... Ambion's custom siRNA service provides the ... gene silencing research. Custom siRNAs can be ... 19-21 base target sequence, or by providing ... check out Ambion's Silencer Validated ...
... Ambion's custom siRNA service provides the ... gene silencing research. Custom siRNAs can be ... 19-21 base target sequence, or by providing ... check out Ambion's Silencer Validated and Silencer ...
Human TGF-beta RIIb Affinity Purified Polyclonal Ab...
Biology Products: