A highly sensitive pressure sensor with nanoscale features was developed based on the gradient concentration of Ti 3 C 2 T x (MXene). The fabrication strategy involved electrostatic adsorption and capillary action utilizing a carbonized sponge as the substrate. In this approach, hexadecyl trimethyl ammonium bromide (CTAB) was added dropwise to the bottom of the carbonized melamine sponge, facilitating the self-assembly of MXene and achieving a gradient attachment of conductive fillers onto the substrate. Furthermore, a layer of polyvinyl alcohol fibers was electrospun between the sensor bottom and the electrode to enhance sensor sensitivity. The pressure-sensitive sensor prepared by this method exhibited an exceptionally strong response within the pressure range of 0−3 kPa. It demonstrated an ultrahigh sensitivity of 381.91 kPa −1 , with a rapid deformation response of 100 ms and a quick recovery response of 30 ms. Notably, the sensor also demonstrated outstanding durability, enduring 8000 loading− unloading cycles without performance degradation. Moreover, it achieved a minimum detection limit as low as 0.1 Pa. Finite element numerical analysis confirmed that the MXene/CTAB/CMF composite prepared using this approach exhibited superior sensing performance under similar deformation conditions. Importantly, this pressure sensor's exceptional sensing capabilities extended to detecting various physiological signals in the human body and daily work scenarios. When integrated with a microprocessor, it accurately processed complex data sets, highlighting its great potential for practical applications.
While transparent photoanodes are highly desired for
smart energy
devices, their performance is still far from expectation. In the present
work, a transparent TiO2 film was prepared using a two-step
spin-coating method, which served as photoanodes of quantum dot-sensitized
solar cells (QDSSCs). A porous TiO2 photoanode prepared
by P25 was also fabricated for comparison. Compared with the porous
TiO2 photoanode, QDSSCs based on the transparent TiO2 film showed an obviously declined short-circuit current density
(J
sc) but greatly improved fill factor
(54.3%), resulting in a larger power conversion efficiency (4.32%).
The reason is due to the decreased series resistance and increased
shunt resistance of solar cells based on the transparent TiO2 photoanode, which is consistent with the requirement of solar cells
to load resistance. The present work proves that the transparent TiO2 film has great potential in the field of transparent solar
cells.
Fluorescent compounds with aggregation-induced emission (AIE) characteristics (or AIEgens) have garnered significant research interest for various applications. The establishment of new AIE mechanisms coupled with quantitative prediction power is crucial...
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