Navigation Links
Penn physicists observe 'campfire effect' in blinking nanorod semiconductors
Date:6/23/2011

physical and biological systems. These unusual Levi statistics arise when many factors compete with each other at different time scales, resulting in a rather complex behavior, with examples ranging from earthquakes to biological processes to stock market fluctuations."

Drndic and her research team, through a combination of imaging techniques, have shown that clustering these nanorod semiconductors greatly increases their total "on" time in a kind of "campfire effect." Adding a rod to the cluster has a multiplying effect on the "on" period of the group.

"If you put nanorods together, if each one blinks in rare short bursts, you would think the maximum 'on' time for the group will not be much bigger than that for one nanorod, since their bursts mostly don't overlap," Novikov said. "What we see are greatly prolonged 'on' bursts when nanorods are very close together, as if they help each other to keep shining, or 'burning.'"

Drndic's group demonstrated this by depositing cadmium selenide nanorods onto a substrate, shining a blue laser on them, then taking video under an optical microscope to observe the red light the nanorods then emitted. While that technique provided data on how long each cluster was "on," the team needed to use transmission electron microscopy, or TEM, to distinguish each individual, 5-nanometer rod and measure the size of each cluster.

A set of gold gridlines allowed the researchers to label and locate individual nanorod clusters. Wang then accurately overlaid about a thousand stitched-together TEM images with the luminescence data that she took with the optical microscope. The researchers observed the "campfire effect" in clusters as small as two and as large as 110, when the cluster effectively took on macroscale properties and stopped blinking entirely.

While the exact mechanism that causes this prolonged luminescence can't yet be pinpointed, Drndic's team's findings support the idea that interacti
'/>"/>

Contact: Evan Lerner
elerner@upenn.edu
215-573-6604
University of Pennsylvania
Source:Eurekalert

0

GOOD

Page: 1 2 3

Related biology technology :

1. McGill physicists find a new state of matter in a transistor
2. U of T physicists squeeze light to quantum limit
3. Physicists discover important step for making light crystals
4. Nanophysicists find unexpected magnetic effect
5. NYU physicists find way to explore microscopic systems through holographic video
6. Physicists at UC Santa Barbara make discovery in quantum mechanics
7. U-M physicists create first atomic-scale map of quantum dots
8. Physicists capture first images of atomic spin
9. UBC, Max Planck formalize partnership among worlds top quantum physicists
10. UC Riverside physicists pave the way for graphene-based spin computer
11. Rice physicists discover ultrasensitive microwave detector
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/20/2013)... ROCKVILLE , Md. and BALTIMORE ... Inc. (BHI), a regional private-public partnership focusing ... to early-stage funding in Central Maryland ... Aiyar, Ph.D., M.B.A., as the first Entrepreneur-in-Residence (EIR) ... (NIH) National Heart, Lung and Blood Institute ...
(Date:5/20/2013)... PA (PRWEB) May 20, 2013 Interventional ... Allegheny General Hospital (AGH) Cardiovascular Institute have ... coronary artery disease (CAD) over the past ... such as balloon angioplasty and coronary artery stent implantation. ... once again play a prominent role in the study ...
(Date:5/20/2013)... 20, 2013 Kitware, a leader in ... that enables the exploration of hospital costs across ... response to the recent release of “Medicare Provider Charge ... 100 most-billed procedures from the Centers for Medicare & ... similar procedures at hospitals across the country has sparked ...
(Date:5/19/2013)... The JM Internet Group (web: jm-seo.org), a ... announced that the company's YouTube channel on SEO ... on YouTube. The company uses YouTube as a way ... training for small businesses with much success. , "I ... helpful for their SEO strategies", explained Jason McDonald, director ...
Breaking Biology Technology:BioHealth Innovation, Inc. Names Ram Aiyar as Entrepreneur-in-Residence to NIH National Heart, Lung and Blood Institute 2BioHealth Innovation, Inc. Names Ram Aiyar as Entrepreneur-in-Residence to NIH National Heart, Lung and Blood Institute 3BioHealth Innovation, Inc. Names Ram Aiyar as Entrepreneur-in-Residence to NIH National Heart, Lung and Blood Institute 4Allegheny General Hospital Cardiovascular Institute Becomes Exclusive Pittsburgh Site for Study of Novel Coronary Artery Disease Device 2Allegheny General Hospital Cardiovascular Institute Becomes Exclusive Pittsburgh Site for Study of Novel Coronary Artery Disease Device 3Allegheny General Hospital Cardiovascular Institute Becomes Exclusive Pittsburgh Site for Study of Novel Coronary Artery Disease Device 4Kitware Enables Interactive Exploration of CMS Medicare Data 2YouTube Channel on SEO Tips Surpasses 175,000 Views, Announces JM Internet Group 2
... December 3 On,November 28, Essilor cancelled 1,600,000 shares, ... dilutive impact of Oceane bond conversions and,the Company,s stock ... These latest cancellations concerned shares acquired under the 6.9,million ... on July,15, 2008 to offset the dilutive impact of ...
... Dec. 2 Transgenomic,Inc. (OTC Bulletin Board: ... Board: PWRM) today announced that Transgenomic has ... rights for Power3 Medical,s Neurodegenerative,Biomarkers, which include ... disease. Transgenomic plans to offer NuroPro(R) ...
... 2 Bionovo, Inc.,(Nasdaq: BNVI ), a pharmaceutical company ... the areas of women,s health and,cancer, announced that Isaac Cohen, Chairman ... at the 20th Annual Piper Jaffray Health,Care Conference at 8 a.m. ... at,the New York Palace Hotel in New York City. , ...
Cached Biology Technology:Transgenomic Signs Letter of Intent for an Agreement to Exclusive License With Option to Acquire Power3 Medical Products' Neurodegenerative Diagnostics 2Transgenomic Signs Letter of Intent for an Agreement to Exclusive License With Option to Acquire Power3 Medical Products' Neurodegenerative Diagnostics 3Transgenomic Signs Letter of Intent for an Agreement to Exclusive License With Option to Acquire Power3 Medical Products' Neurodegenerative Diagnostics 4Bionovo to Present at the Piper Jaffray Healthcare Conference 2
(Date:5/17/2013)... Atlanta residents of all ages will celebrate the ... impact on our daily lives during the inaugural ... engineers and educators from local museums, corporations, K-12 ... than 40 different events for children and adults ... http://atlantasciencefestival.org . , The annual Atlanta ...
(Date:5/17/2013)... in Efficient and Sustainable Global Logistics Operations) is aiming ... the efficiency of intermodal loading systems and the boosting ... 29 European organisations with experience in the logistics sector ... totalling 17,000,000 and a duration of three and a ... develop the semantic components and ontologies shared by the ...
(Date:5/17/2013)... team of scientists using a new X-ray method recorded ... frog embryo in greater detail than ever before., This ... and the search for new treatments for genetic diseases., ... Technologie in Germany, in collaboration with the Advanced Photon ... Laboratory, released the most precise depiction ever of the ...
Breaking Biology News(10 mins):First Atlanta Science Festival set for 2014 2New logistics services that will cut energy consumption and CO2 emissions 2New X-ray method shows how frog embryos could help thwart disease 2
... birth to develop the ability to determine sunrise and ... of Chicago shows. The research sheds new light ... behaviors, according to Brian Prendergast, associate professor in psychology ... paper published April 27 in the journal PLoS One. ...
... to investigate such things as how Pacific Northwest forests ... by pests and diseases is being pruned back to ... located in a 500-year-old forest near Stevenson in southwest ... Washington, the Forest Service,s Pacific Northwest Research Station and ...
... An international team of scientists, led by researchers at ... have developed a new method for discerning the functions ... functional networks that reveal how gene products interact to ... in the April 29 issue of the journal Cell. ...
Cached Biology News:From the beginning, the brain knows the difference between night and day 2Era of canopy crane ending; certain research and education activities remain 2Era of canopy crane ending; certain research and education activities remain 3As the worm turns, its secrets are revealed 2
...
Bovine Renal Artery Endothelial Cells (BRAEC) (>500,000 cells)...
RECK (F-20)...
... polyclonal to Peroxiredoxin 1 Peroxiredoxin ... whose mammalian members have been known ... and apoptosis. Many isoforms (about 50 ... amino acid sequence homology, particularly amino-terminal ...
Biology Products: