Bo Zhang,Shanshan Li,Yuan Wang,Yonggang Wu,Hailei Zhang
With the evolution of information technology, the development of smart materials for the information storage and encryption is in urgent need. Herein, halloysite nanotubes (HNTs)-based self-healing hydrogels were facilely prepared by using aryl arylboronic acid-bearing tetraphenylethylene (TPE) as crosslinker agent, in which the HNTs were covalently bonded into the polymeric matrix. With the addition of HNTs, the obtained hydrogel (H2) shows improved compression resistance performance and self-healing property, which can be customed in certain shapes. The TPE-crosslinked hydrogels (H1 and H2) are able to emit bright blue fluorescence centering at 457 nm when exposed to 365 nm light. By holding together with 1,4-phenylenebisboronic acid-crosslinked hydrogels (H3) with non-fluorescence property, the obtained cube is able to store UV-sensitive QR code information which is potentially to be recognized by QR code scanner or other smart tools.
Two-dimensional (2D) semiconductors have been of great interest in phototransistors in recent years due to their unique optoelectronic and electronic properties. However, their discernible spectral range and the efficiency of light absorption are usually restricted. Here, we present phototransistors based on mixed-dimensional heterostructures formed by zero-dimensional (0D) boron nitride quantum dots (BNQDs) and molybdenum diselenide (MoSe2), which have high responsivity (R), specific detectivity (D*), and external quantum efficiency (EQE), especially in the ultraviolet (UV) spectral range. The heterostructure phototransistors showed a 440% increase in R at 375 nm (from 5.6 to 24.7 A/W) and a 260% increase in D* (from 3.3 to 8.7 × 1011 Jones) compared to bare MoSe2 at the wavelength of 375 nm and a bias of 1 V. A series of characterization and comparison experiments show that charge transfer on BNQDs/MoSe2 results in the photogating effect and optical gain. Meanwhile, the high-performance BNQDs/MoSe2 heterostructure phototransistors exhibit broadband imaging capabilities and thus hold great promise for ultrasensitive light detection, neuromorphic visual sensing, and in-sensor computing applications.
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