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Real-time and label-free biosensing using moiré pattern generated by bioresponsive hydrogel

Bioactive Materials 2023年第5期23卷 383-393页

作者： Semin Kim Geehong Kim Yong Woo Ji Chae-Eun Moon Yuna Jung Hyung Keun Lee JaeJong Lee Won-Gun Koh Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul120-749Republic of Korea Korea Institute of Machinery&Materials Nano-Convergence Mechanical Systems Research Division156 Gajeongbuk-roYuseong-guDaejeon34103Republic of Korea Department of Ophthalmology Yongin Severance HospitalYonsei University College of Medicine363Dongbaekjukjeon-daeroGiheung-guYongin-siGyeonggi-do16995Republic of Korea Institute of Vision Research Department of OphthalmologyYonsei University College of Medicine50-1 Yonsei-roSeodaemun-guSeoul120-749Republic of Korea Department of Ophthalmology Graduate School of Medical ScienceBrain Korea 21 ProjectYonsei University College of MedicineRepublic of Korea College of Pharmacy Yonsei University85 Songdo Hwawak-roYeonsu-guIncheon26426Republic of Korea Department of Ophthalmology Gangnam Severance HospitalYonsei University College of Medicine211 Eonju-roGangnam-guSeoul06273Republic of Korea Department of Nanomechatronics University of Science and Technology217Gajeong-roYuseong-guDaejeon 34113Republic of Korea

Bioresponsive hydrogels are smart materials that respond to various external stimuli and exhibit great potential as biosensors owing to their capability of real-time and label-free ***,we propose a sensing platform based on bioresponsive hydrogels,employing the concept of moiré *** sets of line patterns with different pitch sizes are prepared;a hydrogel grating whose pitch size changes according to external stimuli and a reference grating with constant pitch *** volume changes of the hydrogel caused by external stimuli changes the pitch size of the hydrogel grating,and subsequently,the pitch sizes of the moiré patterns(moiré signal),whose values can be obtained in a real-time and label-free manner through customized moiré microscopy and signal *** confirming that the pH-induced swelling of hydrogel could be monitored using moiré patterns,we performed moiré pattern-based detection of specific proteins using protein-responsive hydrogel that underwent shrinking via interaction with target ***-derived neurotrophic factor and platelet-derived growth factor were selected as the model proteins,and our proposed system successfully detected both proteins at nanomolar *** both cases,the pitch size change of hydrogel grating was monitored much more sensitively using moiré patterns than through direct *** changes in the moiré signals caused by target proteins were detected in ex-vivo environments using a custom-made intraocular lens incorporating the hydrogel grating,demonstrating the capability of the proposed system to detect various markers in intraocular aqueous humor,when implanted in the eye.

关键词： Bioresponsive hydrogel moirépattern Biosensing Intraocular lens Aqueous humor

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Melting of electronic/excitonic crystals in 2D semiconductor moirépatterns:A perspective from the Lindemann criterion

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Chinese Physics B 2023年第10期32卷 118-125页

作者：周纪勇唐剑炬俞弘毅 Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-Sen University(Zhuhai Campus)Zhuhai 519082China State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat-Sen UniversityGuangzhou 510275China

Using the Lindemann criterion,we analyzed the quantum and thermal melting of electronic/excitonic crystals recently discovered in two-dimensional(2D)semiconductor moiré*** show that the finite 2D screening of the atomically thin material can suppress(enhance)the inter-site Coulomb(dipolar)interaction strength,thus inhibits(facilitates)the formation of the electronic(excitonic)***,a strong enough moiréconfinement is found to be essential for realizing the crystal phase with a wavelength near 10 nm or *** the calculated Lindemann ratio which quantifies the fluctuation of the site displacement,we estimate that the crystal will melt into a liquid above a critical temperature ranging from several tens Kelvin to above 100 K(depending on the system parameters).

关键词： moirépattern transition metal dichalcogenides electronic crystal excitonic crystal Lindemann criterion

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Review of phonons in moiré superlattices

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Journal of Semiconductors 2023年第1期44卷 56-67页

作者： Zhenyao Li Jia-Min Lai Jun Zhang State Key Laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China CAS Center of Excellence in Topological Quantum Computation University of Chinese Academy of SciencesBeijing 100049China

moirépatterns in physics are interference fringes produced when a periodic template is stacked on another similar one with different displacement and twist *** phonon in two-dimensional(2D)material affected by moirépatterns in the lattice shows various novel physical phenomena,such as frequency shift,different linewidth,and mediation to the *** review gives a brief overview of phonons in 2D moiré***,we introduce the theory of the moiréphonon modes based on a continuum approach using the elastic theory and discuss the effect of the moirépattern on phonons in 2D materials such as graphene and MoS_(2).Then,we discuss the electron-phonon coupling(EPC)modulated by moirépatterns,which can be detected by the spectroscopy ***,the phonon-mediated unconventional superconductivity in 2D moirésuperlattice is *** theory of phonon-mediated superconductivity in moirésuperlattice sets up a general framework,which promises to predict the response of superconductivity to various perturbations,such as disorder,magnetic field,and electric displacement field.

关键词： moirépattern moiréphonon electron-phonon coupling superconductivity

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Electrically tunable topological transport of moiré polaritons

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Science Bulletin 2020年第18期65卷 1555-1562,M0004页

作者： Hongyi Yu Wang Yao Guangdong Provincial Key Laboratory of Quantum Metrology and Sensing&School of Physics and Astronomy Sun Yat-sen University(Zhuhai Campus)Zhuhai 519082China Department of Physics The University of Hong KongHong KongChina HKU-UCAS Joint Institute of Theoretical and Computational Physics at Hong Kong Hong KongChina

moiré interlayer exciton in transition metal dichalcogenide heterobilayer features a permanent electric dipole that enables the electrostatic control of its flow, and optical dipole that is spatially varying in the moiré landscape. We show the hybridization of moiré interlayer exciton with photons in a planar 2D cavity leads to two types of moiré polaritons that exhibit distinct forms of topological transport phenomena including the spin/valley Hall and polarization Hall effects, which feature remarkable electrical tunability through the control of exciton-cavity detuning by the interlayer bias.

关键词： Valleytronics Transition metal dichalcogenides moirépattern Exciton polariton Anomalous Hall effect

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具有转角石墨烯结构碳纳米材料的电子显微学表征

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电子显微学报 2018年第6期37卷 549-555页

作者：陈琼阳刘诗凯翟阿敏周赟杰康振辉田鹤张泽浙江大学电子显微镜中心硅材料国家重点实验室材料科学与工程学院浙江杭州310027 苏州大学碳素功能材料与器件江苏省重点实验室功能纳米软材料研究所江苏苏州215123

本文通过一步高温烧结石墨烯量子点制备了一种具有转角石墨烯结构的碳纳米材料,并利用球差矫正电子显微镜进行表征。该碳纳米材料中存在大量纳米尺度的孔隙和由几层小片层的石墨烯以随机旋转角堆垛形成的结构。通过HRTEM图像的快速傅立... 详细信息

本文通过一步高温烧结石墨烯量子点制备了一种具有转角石墨烯结构的碳纳米材料,并利用球差矫正电子显微镜进行表征。该碳纳米材料中存在大量纳米尺度的孔隙和由几层小片层的石墨烯以随机旋转角堆垛形成的结构。通过HRTEM图像的快速傅立叶变换(FFT)分析来区分每个旋转角度的石墨烯层,并且多层石墨烯的堆叠还能引起更复杂的层状结构。纳米尺度的局域型转角堆叠结构、孔隙意味着其具有多种可能的带隙结构,使这种碳材料有可能作为转角石墨烯结构与性能关联的研究平台;并且此类碳材料在碱溶液处理后,表现出类似于Pt催化剂的催化特性和一种商业化的20%Pt/C催化剂的催化活性。

关键词：转角石墨烯 moirépattern 球差矫正透射电子显微镜

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