Au/MXene based ultrafast all-optical switching

All-optical switches have arisen great attention due to their ultrafast speed as compared with electric switches.However,the excellent optical properties and strong interaction of two-dimensional(2D)material MXene show great potentials in next-generation all-optical switching.As a solution,we propose all-optical switching used Au/MXene with switching full width at half maximum(FWHM)operating at 290 fs.Compared with pure MXene,the Au/MXene behaves outstanding performances due to local surface plasmon resonance(LSPR),including broadband differential transmission,strong near-infrared on/off ratio enhancement.Remarkably,this study enhances understanding of Au/MXene based ultrafast all-optical switching red-shifted about 34 nm in comparison to MXene,validating all optical properties of Au/MXene opening the way to the implementation of optical interconnection and optical switching.

Red and yellow color aspects of compound 3-dicyclopropylmethylene-5-dicyanomethylene-4-diphenylmethylenetetrahydrofuran-2-one:Chromism effect

The title compound exists as yellow （1Y） and red （1R） crystals, but both gave red solutions. The intermolecular interactions between the CN parts of the crystals in IY are very weak. By the mechanical crushing as well as in solution 1Y again becomes red due to the absence of intermolecular interactions. We explain this color behavior by crystallochromism and solvation chromism.

MXene sensors based on optical and electrical sensing signals:from biological,chemical,and physical sensing to emerging intelligent and bionic devices

Sensing devices are key nodes for information detection,processing,and conversion and are widely applied in different fields such as industrial production,environmental monitoring,and defense.However,increasing demand of these devices has complicated the application scenarios and diversified the detection targets thereby promoting the continuous development of sensing materials and detection methods.In recent years,Tin+1CnTx(n=1,2,3)MXenes with outstanding optical,electrical,thermal,and mechanical properties have been developed as ideal candidates of sensing materials to apply in physical,chemical,and biological sensing fields.In this review,depending on optical and electrical sensing signals,we systematically summarize the application of Tin+1CnTx in nine categories of sensors such as strain,gas,and fluorescence sensors.The excellent sensing properties of Tin+1CnTx allow its further development in emerging intelligent and bionic devices,including smart flexible devices,bionic E-skin,neural network coding and learning,bionic soft robot,as well as intelligent artificial eardrum,which are all discussed briefly in this review.Finally,we present a positive outlook on the potential future challenges and perspectives of MXene-based sensors.MXenes have shown a vigorous development momentum in sensing applications and can drive the development of an increasing number of new technologies.