Nanoscale films of organic dyes for broadband environmental sensing
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Two types of suitably substituted organic dye molecules namely copper phthalocyanine and Rose Bengal were electrostatically self-assembled on gold-coated glass substrates, the gold surface being modified with poly(allylaminehydrochloridethe). The surface plasmon resonance technique was employed to investigate the sensing properties of organic dyes on exposure to three different volatile organic compounds. The films using phthalocyanine molecules were considered to be an optimal material because of its fast response and full recovery. This behaviour is attributed to the film surface morphology, molecular orientation in the film architecture, and sizes and dipole moments of vapours.
KeywordsSurface Plasmon Resonance Volatile Organic Compound Phthalocyanine Rose Bengal Copper Phthalocyanine
This work is sponsored by the Air Force Office of Scientific Research, Air Force Material Command, USAF, under Grant No. FA8655-03-1-3070. The U.S. Government is authorized to reproduce and distribute reprints for Government purpose notwithstanding any copyright notation thereon.
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