Patterned Growth of Vertically Aligned Organic Nanowire Waveguide Arrays

Abstract

25 With a facile physical vapor transport method, we can prepare vertical nanowire arrays from DAAQ with controllable dimensions. Here we report patterned growth of these vertical nanowire arrays on substrates with predefined geometrical and chemical features. The nanowires can also be directly grown on sharp metal or AFM tips, and colloidal particles. Fluorescence microscopy and localized excitation experiments showed that the vertical DAAQ nanowires can act as miniaturized optical waveguides, which have much lower optical loss than the horizontal ones. In addition, the nanowire arrays were directly grown onto an optical fiber probe thus allowing real-time fluorescence measurement of these nanowires on exposure to chemical vapors. RESULTS AND DISCUSSIONSelf-seeded growth. The vapor transport growth of the DAAQ nanowires is considered to be controlled by vapor-solid (VS) process 6 as illustrated in Figure 1A. Figure 1B shows an SEM image of the early stage product of a DAAQ nanowire array grown

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