Navigation Links
Swell new sensors
Date:7/10/2014

WASHINGTON D.C., June 17, 2014 Using microscopic polymer light resonators that expand in the presence of specific gases, researchers at MIT's Quantum Photonics Laboratory have developed new optical sensors with predicted detection levels in the parts-per-billion range. Optical sensors are ideal for detecting trace gas concentrations due to their high signal-to-noise ratio, compact, lightweight nature, and immunity to electromagnetic interference.

Although other optical gas sensors had been developed before, the MIT team conceived an extremely sensitive, compact way to detect vanishingly small amounts of target molecules. They describe their new approach in the journal Applied Physics Letters, from AIP Publishing.

The researchers fabricated wavelength-scale photonic crystal cavities from PMMA, an inexpensive and flexible polymer that swells when it comes into contact with a target gas. The polymer is infused with fluorescent dye, which emits selectively at the resonant wavelength of the cavity through a process called the Purcell effect. At this resonance, a specific color of light reflects back and forth a few thousand times before eventually leaking out. A spectral filter detects this small color shift, which can occur at even sub-nanometer level swelling of the cavity, and in turn reveals the gas concentration.

"These polymers are often used as coatings on other materials, so they're abundant and safe to handle. Because of their deformation in response to biochemical substances, cavity sensors made entirely of this polymer lead to a sensor with faster response and much higher sensitivity," said Hannah Clevenson. Clevenson is a PhD student in the electrical engineering and computer science department at MIT, who led the experimental effort in the lab of principal investigator Dirk Englund.

PMMA can be treated to interact specifically with a wide range of different target chemicals, making the MIT team's sensor design highly versatile. There's a wide range of potential applications for the sensor, said Clevenson, "from industrial sensing in large chemical plants for safety applications, to environmental sensing out in the field, to homeland security applications for detecting toxic gases, to medical settings, where the polymer could be treated for specific antibodies."

The thin PMMA polymer films, which are 400 nanometers thick, are patterned with structures that are 8-10 micrometers long by 600 nanometers wide and suspended in the air. In one experiment, the films were embedded on tissue paper, which allowed 80 percent of the sensors to be suspended over the air gaps in the paper. Surrounding the PMMA film with air is important, Clevenson said, both because it allows the device to swell when exposed to the target gas, and because the optical properties of air allow the device to be designed to trap light travelling in the polymer film.

The team found that these sensors are easily reusable since the polymer shrinks back to its original length once the targeted gas has been removed.

The current experimental sensitivity of the devices is 10 parts per million, but the team predicts that with further refinement, they could detect gases with part-per-billion concentration levels.


'/>"/>

Contact: Jason Socrates Bardi
jbardi@aip.org
240-535-4954
American Institute of Physics
Source:Eurekalert  

Related biology technology :

1. Using pressure to swell pores, not crush them
2. DTx Hosts Webinar on New Intel® Haswell Platform
3. Governor Cuomo Announces Continued Growth at Roswell Park Cancer Institute with Regional Economic Development Council Funding; RPCI Center for Personalized Medicine established with CTG (NASDAQ: CTGX) serving as its technology partner
4. Silicon-carbon electrodes snap, swell, dont pop
5. Menon Biosensors Demonstrates Industry Leading Sensitivity Levels for Detection of Tuberculosis and Clostridium difficile
6. Global Aptamers Market Technology Trend Analysis Market Report 2013-2018: Therapeutics, Diagnostics, Biosensors, Biomarker/Drug Discovery & Applications
7. New Accurate Temperature Sensors Now Offered by Oven Industries Inc
8. Chemists develop innovative nano-sensors for multiple proteins
9. Global Printed and Flexible Sensors 2013 Report: Forecasts, Players, Opportunities
10. LamdaGen Corporation Announces Japan Patent Issuance for Enzymatic Diagnostic Assays on Plasmonic Nano-Sensors
11. Burns Engineering Announces Expanded Selection of Miniature Temperature Sensors
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Swell new sensors
(Date:8/14/2017)... (PRWEB) , ... August 14, 2017 , ... ... provide essential device-to-computer interconnect using USB or PCI Express, announced the release of ... SYZYGY is intended to satisfy the need for a compact, low cost, low ...
(Date:8/11/2017)... ... ... Algenist continues to disrupt the skincare industry with today’s debut of GENIUS Liquid ... the key structural element skin needs to maintain its youthful appearance and Algenist is ... First to market with proprietary collagen water active , Active ...
(Date:8/10/2017)... ... 09, 2017 , ... The era of using extracellular vesicles ... team at Capricor Therapeutics, Inc. utilized a cardiosphere-derived stem-like cell culturing process to ... Travis Antes, head of analytical development at Capricor Therapeutics Inc., will be the ...
(Date:8/10/2017)... ... August 10, 2017 , ... DrugDev and the ... to demonstrate how Good Clinical Practice (GCP) can be used throughout the site ... webinar will discuss the importance of GCP compliance, how sites are affected by GCP ...
Breaking Biology Technology:
(Date:4/5/2017)... , April 4, 2017 KEY FINDINGS ... to expand at a CAGR of 25.76% during the ... is the primary factor for the growth of the ... https://www.reportbuyer.com/product/4807905/ MARKET INSIGHTS The global stem ... technology, application, and geography. The stem cell market of ...
(Date:3/30/2017)... -- On April 6-7, 2017, Sequencing.com will host the world,s ... at Microsoft,s headquarters in Redmond, Washington ... health and wellness apps that provide a unique, personalized ... is the first hackathon for personal genomics and the ... the genomics, tech and health industries are sending teams ...
(Date:3/29/2017)... , March 29, 2017  higi, the health ... in North America , today announced ... and the acquisition of EveryMove. The new investment and ... set of tools to transform population health activities through ... lifestyle data. higi collects and secures data ...
Breaking Biology News(10 mins):