MXenes, or transition metal carbides or nitrides, as an advanced 2D materials have already attracted extensive attention due to their high conductivity and large specific surface area for applications in the field of energy storage. MXenes also have many other advanced properties such as good transmittance and adjustable work function over a large range. However, few works study the properties of MXenes in the field of optoelectronics. Here, the optoelectronic properties of Ti3C2TX (with a work function of 4.37 eV) on n‐type silicon (n‐Si) of vertical van der Waals heterostructures are studied. The Ti3C2TX not only functions as the transparent electrode but also contributes to the separation and transport of photo‐induced carriers. After investigations on the influence of annealing, temperature, illumination, and applied voltage on the performance of Ti3C2TX/n‐Si Schottky junction heterostructures, this study fabricates a self‐driven vertical junction photodetectors with high response and recovery speeds. It is believed that the excellent photoelectric properties of MXenes will attract many researchers' attention to the application of MXenes in the photoelectrical field.
Pressure sensors with high elasticity are in great demand for the realization of intelligent sensing, but there is a need to develope a simple, inexpensive, and scalable method for the manufacture of the sensors. Here, we reported an efficient, simple, facile, and repeatable "dipping and coating" process to manufacture a piezoresistive sensor with high elasticity, based on homogeneous 3D hybrid network of carbon nanotubes@silver nanoparticles (CNTs@Ag NPs) anchored on a skeleton sponge. Highly elastic, sensitive, and wearable sensors are obtained using the porous structure of sponge and the synergy effect of CNTs/Ag NPs. Our sensor was also tested for over 2000 compression-release cycles, exhibiting excellent elasticity and cycling stability. Sensors with high performance and a simple fabrication process are promising devices for commercial production in various electronic devices, for example, sport performance monitoring and man-machine interfaces.
The
porous and elastic reduced graphene aerogel (rGA) is a promising
active material for piezoresistive pressure sensors (PRSs) to realize
an electronic skin. Due to the specific working mechanism and the
limitation of the rGA’s monolithic conductive network, the
PRSs based on rGA suffer from a limited change of resistance with
mechanical deformation, so they show poor sensitivity and cannot detect
low pressures. Here we aim to improve the sensitivity of the PRS and
make it suitable for a low-pressure system (0.5–8 kPa) through
an effective method. The monolithic rGA is broken into small pieces
by cutting (named as CGA). The sensitivity of the PRS based on CGA
can be improved by 10 times that of the uncut rGA (named as UCGA).
The resistance variation ratio of CGA (0.96) is 1.45 times of the
resistance variation ratio of the UCGA (0.66). By using a package
of elastic polypropylene thin films (PP), the cycle stability performance
of CGA remains stable after 4200 cycles. The CGA can detect the pulse
of a human being with sensitivity higher than the UCGA and the ordinary
sensors. This method is simple, effective, and universal to improve
the sensitivity of PRS based on porous and elastic materials.
Co-doped FeS 2 composites were successfully synthesized through a facile microwave-hydrothermal process. The products were characterized by X-ray diffraction, X-ray Photoelectron Spectroscopy, field emission scanning electron microscope, UV-Vis diffuse reflectance spectra, and Raman spectroscopy. Cobalt doping didn't change the basic structure of pyrite FeS 2 . But the spherical FeS 2 product changed into some aggregated laminar particles. The Co-doped FeS 2 product exhibited higher absorption in visible-light region and the photocatalytic performance was greatly enhanced. The Co 0.333 Fe 0.667 S 2 product could decompose 48.9 % methylene blue within 210 min, which was 36.5 % higher than that of the pristine FeS 2 .
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