Demonstration of a ZnO-Nanowire-Based Nanograting Temperature Sensor

In this study,we experimentally demonstrate a miniature fiber thermometer based on tip-integrated ZnO-nanowire-nanograting.The sensor has a diameter less than 1μm and the length of the Bragg grating is sub-10μm.The ZnO-nanowire-nanograting is sensitive to the environmental temperature change.Thus,the intensity of the light whose wavelength is in the rising or falling region of the nanograting spectrum will vary with the shift in wavelength due to change in temperature.Taking one wavelength(655 nm)in the rise linear region of the nanograting spectrum,a sensitivity of 0.066nW/℃in the air is achieved experimentally.The proposed temperature sensor has the superiorities of compactness,stableness,and easy fabrication compared to regular fiber grating sensors,offering great potential for detecting inside minimal volume environments.

Optical fiber-based magnetically-tuned graphene mechanical resonator

In this study,an optical fiber-based magnetically-tuned graphene mechanical resonator(GMR)is demonstrated by integrating superparamagnetic iron oxide nanoparticles on the graphene membrane.The resonance frequency shift is achieved by tuning the tension of the graphene membrane with a magnetic field.A resonance frequency tunability of 23 kHz using a 100 mT magnetic field is achieved.The device provides a new way to tune a GMR with a non-contact force.It could also be used for weak magnetic field detection in the future with further improvements in sensitivity.

AIEgen-lipid structures:Assembly and biological applications

Aggregation-induced emission(AIE)molecules possess notable advantages outperforming traditional aggregation caused quenching(ACQ)materials on various aspects.They are rapidly developed these years.More and more AIE luminogens(AIEgens)are designed to possess multifunctions such as the abilities of near-infrared two-photon absorption and reactive oxygen species(ROS)generation,which could be used for deep tissue imaging and photodynamic therapy.The AIEgens exhibit great potential in biological application field.However,despite the photophysics stability and ROS generation ability in aggregated states are favorable conditions,their applications in biological field are retarded by uncontrolled size,single imaging mode,low targeting efficiency,and also poor biocompatibility and dispersibility in physiological environment.The combination of AIEgen and lipid is a straightforward,promising,and intensively used way to solve the above problems.Due to the special amphipathic property of lipid,which results from a hydrophilic head and hydrophobic tail structure,there are various possibilities of combination modes between lipid and AIEgen.Even a little procedure or condition change during the synthesis process will impact the structure of obtained product,which can further influence its application.Herein,we summarize the synthesis methods of different AIEgen-lipid compounds with diverse structures and properties,as well as their biological applications in this contribution,which has not been presented before,being aimed at serving as a synthesis and application reference for these promising AIEgen-lipid compounds applied in biological region.