Abstract
An interface self-assembly reaction between HgCl2 and an amphiphilic heteroaromatic styryl dye, 2-(4-dihexadecylaminostyryl) benzothiazole methiodide (I), was studied. Its Langmuir−Blodgett films Ia, Ib, and Ic fabricated from different subphases (pure water, 5 × 10-8 M HgCl2, and 5 × 10-7 M HgCl2, respectively) were characterized by using UV−vis spectra and XPS measurements. Compared to those of film Ia, the seond-harmonic responses and photocurrent generation from film Ib and Ic were obviously enhanced with the addition of HgCl2 into the subphase. Under ambient conditions (0.5M KCl), the quantum yields of photoelectric conversion are 0.73%, 0.95%, and 2.45% for Ia, Ib, and Ic respectively. The effects of some factors such as bias voltage, methyl viologen (MV2+) and hydroquinone (H2Q) on the photocurrent generation have also been investigated.
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