Ultra-fast and ultra-sensitive 2,4-dinitrotoluene vapor sensing using gold nanoparticle assembled SERS probes

Maung Kyaw Khaing Oo; Chia-Fang Chang; Yuze Sun; Xudong Fan

doi:10.1117/12.883687

16 May 2011 Ultra-fast and ultra-sensitive 2,4-dinitrotoluene vapor sensing using gold nanoparticle assembled SERS probes

Maung Kyaw Khaing Oo, Chia-Fang Chang, Yuze Sun, Xudong Fan

Author Affiliations +

Proceedings Volume 8034, Photonic Microdevices/Microstructures for Sensing III; 80340D (2011) https://doi.org/10.1117/12.883687
Event: SPIE Defense, Security, and Sensing, 2011, Orlando, Florida, United States

Abstract

Surface enhanced Raman scattering (SERS) amplifies the small Raman scattering cross section of molecules toward distinguishable signal. It has been advanced into an influential label-free nondestructive method to measure vibrational fingerprints of molecular structures directly. We report here the demonstration of vapor detection of 2,4-dinitrotoluene (2,4-DNT), a typical manufacturing impurity of trinitrotoluene (TNT) based explosives, using reproducible ultrasensitive SERS substrates, i.e., assembled gold nanoparticles (GNPs) synthesized by a UV photoreduction method. The estimated detection limit was achieved 0.4 attogram, which corresponds to a sub-ppb DNT concentration in air. The 2,4- DNT molecules was noticeable within a minute of exposure to the DNT vapor at room temperature. The detection time was as short as only 2 seconds with 12 mW 785 nm laser excitation at the SERS substrate. Our study shows that larger GNPs (~ 117 nm in diameter) with higher density, an enhancement factor of 5.6x10⁶, exhibits the high sensitivity and the fast detection response, as compared to smaller and lower density GNPs. Dynamic depletion by laser heating indicates that our GNP based sensor is possible real time 2,4-DNT detection.

Citation Download Citation

Maung Kyaw Khaing Oo, Chia-Fang Chang, Yuze Sun, and Xudong Fan "Ultra-fast and ultra-sensitive 2,4-dinitrotoluene vapor sensing using gold nanoparticle assembled SERS probes", Proc. SPIE 8034, Photonic Microdevices/Microstructures for Sensing III, 80340D (16 May 2011); https://doi.org/10.1117/12.883687

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available