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Rodlike, olivelike, pineapplelike, and particlelike nanocrystals of theYVO4:Eu (5 at. % Eu) were synthesized by a hydrothermal reaction with different conditions, respectively. The rodlike nanocrystal has a rectangular cross-section with about 35 x 60 nm2 and a length of about 220 nm. The olivelike nanocrystal has an equatorial diameter of approximately 40 nm and a length of approximately 200 nm. The pineapplelike nanocrystal with an equatorial diameter of approximately 200 nm and a length of approximately 300 nm, is a superstructure consisting of self-organized nanorods with a diameter of approximately 20 nm and a length of approximately 50 nm. The particlelike nanocrystals show globular and polyhedral shape with a diameter of approximately 50 nm. Their UV-vis absorption peaks are at 305, 308, 285, and 280 nm, respectively, and there is such a trend that the absorption peaks shift to higher energy as the size of the particles decreases. Compared with other-shape nanocrystals, the luminescence intensity of the olivelike nanocrystals is obviously enhanced. It suggests that we could obtain the function-improved materials by tailoring the size and shape of theYVO4:Eu nanostructures.

Two new flexible visible-light photodetectors based on ZrS3 nanobelts films are fabricated on a polypropylene (PP) film and printing paper, respectively, by an adhesive-tape transfer method, and their light-induced electric properties are investigated in detail. The devices demonstrate a remarkable response to 405 to 780 nm light, a photocurrent that depends on the optical power and light wavelength, and an excellent photoswitching effect and stability. This implies that ZrS3 nanobelts are prospective candidates for high-performance nanoscale optoelectronic devices that may be practically applied in photodetection of visible to near infrared light. The facile fabrication method is extendable to flexible nanodevices with different nanostructures.

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