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:3/3/2015)... 03, 2015 Becht Engineering Co., ... it has acquired The CECON Group, Inc., located ... were not announced. , Becht Engineering (http://www.becht.com ... sector including oil and gas production, refining, petrochemical, ... nuclear power sectors. The company has twelve offices ...
(Date:3/3/2015)... Research and Markets ( http://www.researchandmarkets.com/research/s3s3t8/personalized ... new report "Personalized Medicine - Scientific and ... The aim of personalized medicine or ... to the right patient and, in some cases, ... patient according to his/her genotype. This report describes ...
(Date:3/3/2015)... 2015  Johnson & Johnson Innovation LLC today announced ... (JLABS @SSF), a 30,000-square foot incubator located ... Francisco, Calif. The Johnson & Johnson Innovation, ... from across the healthcare spectrum including biotech, pharmaceutical, medical ... first resident startups have been selected, including the winners ...
(Date:3/3/2015)... , March 3, 2015  Synthetic Biologics, Inc. (NYSE ... and diseases, with a focus on protecting the microbiome, announced ... scheduled to present at the 27th Annual ROTH Conference being ... Laguna Niguel in Dana Point, CA. ... March 10, 2015 at 1:00 p.m. (Pacific Time). ...
Breaking Biology Technology:Global Personalized Medicine Market Report 2015 - Scientific and Commercial Aspects 2014-2024 2Global Personalized Medicine Market Report 2015 - Scientific and Commercial Aspects 2014-2024 3Johnson & Johnson Innovation Opens JLABS @South San Francisco and Announces First Five Resident Startups 2Johnson & Johnson Innovation Opens JLABS @South San Francisco and Announces First Five Resident Startups 3Johnson & Johnson Innovation Opens JLABS @South San Francisco and Announces First Five Resident Startups 4Johnson & Johnson Innovation Opens JLABS @South San Francisco and Announces First Five Resident Startups 5Synthetic Biologics to Present at the 27th Annual ROTH Conference 2
... Arena Pharmaceuticals, Inc.,(Nasdaq: ARNA ) announced today that ... Second Annual Hidden Gems Conference on October,13, 2008 at ... the,Waldorf=Astoria Hotel in New York City. Robert E. Hoffman, ... to provide an,overview of the company, including its clinical ...
... 7 Nektar,Therapeutics (Nasdaq: NKTR ) President and ... upcoming Natixis Bleichroeder Second Annual Hidden Gems,Conference in New ... at 2:30 p.m. ET., The presentation will be ... Relations, Events Calendar section of the Nektar website:, http://www.nektar.com ...
... 7 MKS Instruments, Inc.,(Nasdaq: MKSI ), ... and improve productivity, today announced that it will ... opening on Wednesday,October 22, 2008. A conference call ... 8:30 a.m. (Eastern Time). The call will be ...
Cached Biology Technology:Arena Pharmaceuticals to Present at the Natixis Bleichroeder Second Annual Hidden Gems Conference 2Arena Pharmaceuticals to Present at the Natixis Bleichroeder Second Annual Hidden Gems Conference 3
(Date:2/18/2015)... Feb. 18, 2015  Cepheid (NASDAQ: CPHD ) ... following conferences, and invited investors to participate via webcast. ... MA Tuesday, March 3, 2015 at 11.20 a.m. ... Orlando, FL Wednesday, March 4, 2015 at ... access the live webcasts for these events, please visit Cepheid,s ...
(Date:2/12/2015)... 2015 NXT-ID, Inc. (NASDAQ: NXTD ... authentication company focused on the growing mobile commerce market, ... for DISTRIBUTED METHOD AND SYSTEM TO IMPROVE ... further establishes NXT-ID,s position in the emerging "Internet of ... ability for multiple devices to collaborate with one another ...
(Date:2/9/2015)... Texas , Feb. 9, 2015  Lintec of ... fabrication methods for carbon nanotube (CNT) macrostructures, including sheets, ... at Dallas (UTD). Leveraging the vast industrial ... Tokyo, Japan , Lintec of America is ... Richardson, TX , focusing on scaling up ...
Breaking Biology News(10 mins):Cepheid to Webcast Upcoming Financial Presentations 2NXT-ID Patents Collaborative Services to Enable the "Internet of Things" 2NXT-ID Patents Collaborative Services to Enable the "Internet of Things" 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 2Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 3Lintec announces exclusive license to commercialize innovative carbon nanotube technology from the University of Texas at Dallas 4
... researchers from the British Antarctic Survey have collected individuals from ... and subjected them to increasing levels of water temperature to ... conditions that they are likely to experience in the future. ... living really close to their upper temperature range, and that ...
... A University of Wisconsin-Madison biomedical engineer and colleagues have developed ... could spare some women with increased breast cancer risk the ... a questionable lump or lesion. The universal technology will ... malignant or benign. The American Cancer Society recommends ...
... an effort to increase understanding of the medical device ... of product development more effectively, researchers at Stanford University ... device development process. Published in the June ... , the model was constructed based on best-practice analysis ...
Cached Biology News:New MRI technique could mean fewer breast biopsies in high-risk women 2Stanford researchers publish comprehensive model for medical device development 2Stanford researchers publish comprehensive model for medical device development 3
Phospho-TAO2 (S181) Affinity Purified Polyclonal Ab Protein Family: Other Intracellular Kinases...
PEG 8000, Molecular Biology Grade...
... Histone Deacetylase (HDAC) Antibody Sampler Kit ... (HDAC1) Antibody, Catalog #2062, 40 ul Histone ... ul Histone Deacetylase 4 (HDAC4) Antibody, Catalog ... Antibody, Catalog #2082, 40 ul Histone Deacetylase ...
Immunogen: Synthetic Peptide: C N(185) D G T E F G G S I Y Q K(197) Storage: -20 C, Avoid Freeze/Thaw Cycles...
Biology Products: