Dynamic 3D holographic projection of vectorial images with a multimode fiber

An optical multimode fiber(MMF)is capable of delivering structured light modes or complex images with high flexibility.Here,we present a holographic approach to enable the MMF as a 3D holographic projector with the capability of complete polarization control.By harnessing the strong coupling of the spatial and polarization degrees of freedom of light propagating through MMFs,our approach realizes active control of the output intensity and polarization in 3D space by shaping only the wavefront of the incident light.In this manner,we demonstrate MMF-based holographic projection of vectorial images on multiple planes via a phase-only hologram.Particularly,dynamic projection of polarization-multiplexed grayscale images is presented with an averaged Pearson correlation coefficient of up to 0.91.Our work is expected to benefit fiber-based holographic displays,data transmission,optical imaging,and manipulation.

Predesigned covalent organic framework with sulfur coordination: Anchoring Au nanoparticles for sensitive colorimetric detection of Hg(Ⅱ)

Targeted construction of new covalent organic frameworks(COFs)with specific purposes and rationalities to build colorimetric assay platform for environmental pollutant monitoring have attracted increasing interest.However,it is still challenging due to lack of available coordination sites inside COFs pores and only a slight bonding ability for anchoring metal.In this work,a two-dimensional(2D)COFs(termed as Tz-COF)with high crystallinity,excellent chemical stability,and abundant sulfur coordination in its skeletons was synthesized and used for the confined growth of Au NPs.It was found that the Au NPs showed significant dispersibility for the support of Tz-COF.The proposed Tz-COF@Au NPs possessed outstanding Hg^(2+)-activated peroxidase-like activity benefited from physicochemical properties of gold amalgam and synergistic effect between COFs and Au NPs to oxidize chromogenic substrate.Based on highly efficient activity and distinctive color evolution,the strategy for detecting Hg^(2+)was developed and successfully applied to determine the content of Hg^(2+)in real environmental samples.This work manifests that a potential strategy to establish a colorimetric assay platform for environmental pollutant monitoring based on the targeted manufacturing of novel COFs with specific functions.

Conjugated Random Tpeoilymer Donors towards High-Efficiency Polymer Solar Cells

Over the past decades,polymer solar cells(PSCs)which contain conjugated polymers as electron donor and/or acceptor materials in active layers have achieved the power con version efficiency(PCE)over 17%.Among them,tremendous alternative donor-acceptor(D-A)type conjugated copolymers have been reported as donor materials.Nevertheless,plenty of rooms still exist to further improve the photovoltaic performs nee for practical applications.Besides the exploration of the increasingly challenging novel D and/or A monomers to construct new D-A copolymer donors,conjugated random terpolymer donors which involve a third existing monomer(D or A)provide an extra simple promising strategy to promote the photovoltaic performance to a higher level.Herein,recent progress on random terpolymer donors for efficient PSCs was reviewed.Firstly,random terpolymer donors were classified by several typical molecular building blocks.Then,the influences of the third monomer on various random terpolymers were highlighted according to the enhancement of light-harvesting ability,modification of energy levels and optimization of the bulk-heterojunction(BHJ)morphology.Finally,several issues which might be concerned in future research on random terpolymer donors were proposed.This review may be helpful for providing guidelines to design efficient random terpolymer donors as well as better-understanding of the structure-property-performance correlations towards high performance PSCs via random terpolymer approach.

Copper(Ⅱ) ions-immobilized virus-like hollow covalent organic frameworks for highly efficient capture and sensitive analysis of amyloid beta-peptide 1–42 by MALDI-MS

Amyloid beta-peptide 1-42(Aβ1-42)is one of the biomarkers of Alzheimer's disease,and its selective capture and quantitative detection are important for diagnosis and treatment of Alzheimer's disease.Herein,copper(Ⅱ)ions-immobilized virus-like hollow covalent organic frameworks(V-HCOFs@Cu^(2+))were synthesized by a facile approach.The as-prepared V-HCOFs@Cu^(2+)showed unique morphology,ultra-high specific surface(2552 m^(2)/g),uniform mesoporous structure(3.2 nm),superior chemical stability and abundant binding sites.Based on these excellent properties,the V-HCOFs@Cu^(2+)could be adopted as an ideal enrichment probe for highly efficient capture of Aβ1-42,exhibiting high adsorption capacity(320 mg/g),and fast adsorption equilibration time(3 min).In addition,an attractive approach of the V-HCOFs@Cu^(2+)-based matrix-assisted laser desorption/ionization mass spectrometry(MALDI-MS)was developed for the rapid screening and quantitative analysis of Aβ1-42 in human serum by using C-peptide as an internal standard,which exhibited low limit of detection(LOD,0.2 fmol/μL),and satisfactory recovery.This work provides an alternative solution for enrichment of biomarkers and also offers the potential applications of COFs in clinical analysis.