Surface And Interfacial Regulation For Smart Responsive Low-dimensional Solid Materials And Its Application Research

Smart responsive low-dimensional solid materials have a certain response of external stimuli(such as force,heat,light,electricity,magnetic fields and humidity)and produce adaptive responses or energy conversions(such as corresponding mechanical,electrical,thermal,optical,magnetic,and chemical properties).With the development of materials science and technology,the requirements for material functionality are also increased.Developing and design of functional low-dimensional solid materials have been heavily researched and received considerable interest.It has also become an important research content to expand the functional application of nanomaterials.However,developing gentle,simple and green material-preparation technology and explore efficient,accurate and controllable surface/interface control strategies to improve the response performance of materials remains the main challenge.Based on the above analysis,the regulation of the size and morphology of nanomaterials by advanced nano-synthesis technology,the regulation of nano-solid surface/interface by surface modification and interface engineering strategy is an effective way to construct specific functional nanomaterials.In this paper,smart responsive low-dimensional solid materials are obtained and functionalized by surface modification and interface engineering strategies.Based on this,the performance of the obtained materials and related devices have been researched and developed.The authors synthesized zero-dimensional quantum dot materials and two-dimensional nanosheet materials.Through the strategies of light-assisted surface etching and interface optimization,the smart response performance of low-dimensional solid materials were studied and related devices were developed.In addition,the author also carried out some exploratory research on the greening and massive preparation of function-oriented low-dimensional solid materials.Focusing on the topic of surface and interfacial regulation for smart responsive low-dimensional solid materials and application,the main research contents are as follows:1.We demonstrate an interface engineering control strategy to construct a humidity-responsive actuator and sensor.Based on the moisture sensitivity of graphene oxide nanosheets,a humidity-triggered actuator and hygro-sensitive piezoelectric detector was presented.In this humidity-responsive actuator,interface optimization strategy and GO with abundant hydroxy were developed.Graphene oxide and ethyl cellulose combined with chemical bonds,which successfully building a bimorph with binary synergy strengthening and toughening.Good hygroscopicity of graphene oxide accompanied large volume expansion triggers giant moisture responsiveness greater than 90 degrees.Meanwhile,we employ the actuator as the engine to drive piezoelectric detector.Moreover,the open circuit voltage of piezoelectric detector holds a peak value around 0.1 V and exhibits good reversibility.2.We demonstrate a surface modification and interface engineering regulation synergistic strategy to construct a photosensitive response actuator.Based on the photothermal effect of carbon nanotubes,a graphene oxide&carbon nanotube/ethyl cellulose photosensitive response actuator was presented.In this photosensitive response actuator,we surface-treat the carbon nanotubes and introduce the carbon nanotubes into the graphene oxide layer of the bimorph structure film.Due to the carbon nanotubes have good light absorbing ability and can convert absorbed light energy into heat energy,we prepared the photosensitive actuator.Because of the difference in thermal expansion coefficient of the two layers,this actuator has flexible response performance.Subsequently,different functional devices were fabricated.We expect that multi-responsive actuators and related devices could be used in a variety of multi-function nanosystems and serve smart devices.3.We demonstrate a surface modification strategy to construct a two-dimensional nanosheet with a photosensitive response sandwich structure.Based on the promotion of photo-generated carrier separation,an efficient photoreaction behavior was achieved.Using the surface treated of UV-assisted etching,a two-dimensional nanosheet was prepared.In our case,this photo-response system integrated multifunction into a single structure,which successfully introduces a stable built-in electric field,realizing high-effective carrier separation.By dimensional confinement of the 2D sandwich structure,the carrier concentration is increased.We anticipate that 2D sandwich photocatalyst holds promises for the application and expansion of photocatalysis research.4.We demonstrate a tungsten oxide quantum dot smart material with fast photochromic response and achieved its green and macrometric preparation.This material realized the high conversion from complete transparence to low penetration.In this case,solar-light irradiation of WO3 AQDs induced valence-state regulation,successfully triggering reversible color change(colorless??blue).Only irradiation within 10 seconds,the color of the WO3 AQDs turned blue and the transmittance of near-infrared and visible-light transmittance declined more than 50%.After moving away from the solar-light,the color can return to the original state within 5 min.Moreover,cycles repeating experiment verified the stability of the WO3 AQDs.These results represent the quick photo-response and good reversibility in tungsten-oxide-related photochromic materials.We anticipate that green synthesis of photochromic materials with good properties would substantially facilitate the future industrial applications of novel smart device.