Journal
ACS NANO
Volume 5, Issue 6, Pages 4293-4299Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn103211d
Keywords
assembly; evanescent wave; ZnO nanorod; AFAs; fluorescence; sensor; vapor
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Funding
- National Natural Science Foundation of China [61007066, 51003118, 60977067, 50973128, 20773156]
- Ministry of Science and Technology of China [2007AA06A407, 2009BAK64B03]
- CAS
- SIMIT Technology and Innovation Foundation
- Shanghai Science and Technology Committee [09XD1405000]
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Nanomaterials and -structures have attracted much attention owing to their applications to ultrasensitive nanodevices. In this work, ordered assembly arrays of ZnO nanorods have been hydrothermally fabricated and used as optical substrates of fluorescence sensors for toxic vapors. The unique fastigiate nanorod assembly combines merits of single fibers and dusters, possessing identical orientation, large surface-to-volume ratio, evanescent transmission, and evanescent coupling. As coated on the assembly arrays, different sensing materials all generated amplified spontaneous emission (ASE) action such that the fluorescence intensity of the narrowed spectrum was 52.4-fold enhanced. Results of sensing experiments indicate that sensors based on the assembly arrays displayed 100% elevated normalized quenching rate and several times longer full-load time compared with reference sensors. This work provides a facile method to fabricate secondary structures of 10 rigid material and presents a new way to design highly sensitive optic sensors. Furthermore, evanescent excitation caused ASE action of fluorescent organics, and the correlative sensitivity gain is of interest in both theoretical research and the applications field.
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