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Highly Flexible and Broad‑Range Mechanically Tunable All‑Wood Hydrogels with Nanoscale Channels via the Hofmeister Effect for Human Motion Monitoring

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Nano-Micro Letters 2022年第5期14卷 192-205页

作者： Guihua Yan Shuaiming He Gaofeng Chen Sen Ma Anqi Zeng Binglin Chen Shuliang Yang Xing Tang Yong Sun Feng Xu Lu Lin Xianhai Zeng College of Energy Xiamen UniversityXiamen 361102People’s Republic of China State Key Laboratory of Pulp and Paper‑Making Engineering South China University of TechnologyGuangzhou 510640People’s Republic of China Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityNo.35Tsinghua East RoadHaidianBeijing 100083People’s Republic of China

Wood-based hydrogel with a unique anisotropic structure is an attractive soft material,but the presence of rigid crystalline cellulose in natural wood makes the hydrogel less Flexible.In this study,an all-wood hydrogel was constructed by cross-linking cellulose fibers,polyvinyl alcohol(PVA)chains,and lignin molecules through the Hofmeister effect.The all-wood hydrogel shows a high tensile strength of 36.5 MPa and a strain up to~438%in the longitudinal direction,which is much higher than its tensile strength(~2.6 MPa)and strain(~198%)in the radial direction,respectively.The high mechanical strength of all-wood hydrogels is mainly attributed to the strong hydrogen bonding,physical entanglement,and van der Waals forces between lignin molecules,cellulose nanofibers,and PVA chains.Thanks to its excellent flexibility,good conductivity,and sensitivity,the all-wood hydrogel can accurately distinguish diverse macroscale or subtle human movements,including finger flexion,pulse,and swallowing behavior.In particular,when“An Qi”was called four times within 15 s,two variations of the pronunciation could be identified.With recyclable,biodegradable,and adjustable mechanical properties,the all-wood hydrogel is a multifunctional soft material with promising applications,such as human motion monitoring,tissue engineering,and robotics materials.

关键词： Wood hydrogel Hofmeister effect Tunable mechanical strength Flexible Biodegradable

Electrospun Bi-decorated Bi_(x)Ti_(y)O_(z)/TiO_(2) Flexible carbon nanofibers and their applications on degradating of organic pollutants under solar radiation

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Journal of Materials Science & Technology 2023年第19期150卷 114-123页

作者： Liangtao Yao Changpo Sun Hui Lin Guisheng Li Zichao Lian Ruixin Song Songlin Zhuang Dawei Zhang Engineering Research Center of Optical Instrument and System Ministry of Education and Shanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China Standards and Quality Center of National Food and Strategic Reserves Administration Beijing 100834China Department of Chemistry College of ScienceUniversity of Shanghai for Science and TechnologyShanghai 200093China

Presently,photocatalytic degradation has emerged as an attractive and efficient technology for wastewater treatment.In order to avoid hurdles,such as difficulty in the suspended photocatalyst segregation from the aqueous system and low reutilization rate,the strategy of immobilizing photocatalysts with electro-spun fibers has been widely studied.However,those methods usually require multi-step preparation and complex operations.Considering this,a novel metallic Bi-decorated Flexible multiphase Bi_(x)Ti_(y)O_(z)/TiO_(2) electrospun carbon nanofibers(Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs)with high photocatalytic efficiency,good mechanical property,good stability,easy separation,and recovery were synthesized via a one-step approach of pre-oxidation and carbonization treatment.The as-prepared Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs with multiphase Bi_(x)Ti_(y)O_(z),anatase TiO_(2),and metallic Bi particles embedded not only enhance the harvest of light but also pro-vide more separation paths for photogenerated carriers,which improve photocatalytic efficiency greatly.The Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs(S3)exhibited excellent photocatalytic performance and the degradation rate of 10 mg L^(-1) Rhodamine B(RhB)was up to 97%in only 30 min under simulated sunlight irradiation.Also,S3 exhibited stable activity during 5 cycles of experiments since the degradation rates remained at about 97%in 30 min.The mechanism of degradation of RhB by Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs in the photocat-alytic process was also proposed based on active species trapping experiments.The work in this paper shows that Bi/Bi_(x)Ti_(y)O_(z)-TiO_(2)/CNFs are easy to prepare and have high photocatalytic ability and stability,thereby offering a new strategy in catalyst immobilization and wastewater treatment.

关键词： Electrospun nanofibers Photocatalyst Flexible

A Flexible solid polymer electrolyte enabled with lithiated zeolite for high performance lithium battery

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Nano Research 2023年第7期16卷 9443-9452页

作者： Zhiyu Ding Qiming Tang Qi Zhang Penghui Yao Xingjun Liu Junwei Wu Shenzhen Key Laboratory of Advanced Materials Department of Materials Science and EngineeringHarbin Institute of Technology(Shenzhen)Shenzhen 518055China Maryland Energy Innovation Institute University of MarylandCollege ParkMD 20742USA Department of Chemical and Metallurgical Engineering Aalto UniversityKemistintie 1Aalto FI-00076Finland

Solid-state lithium batteries using composite polymer electrolytes(CPEs)have attracted much attention owing to their higher safety compared to liquid electrolytes and flexibility compared to ceramic electrolytes.However,their unsatisfactory lithium-ion conductivity still limits their development.Herein,a high ion conductive CPE with multiple continuous lithium pathways is designed.This new electrolyte consists of poly(vinylidene fluorideco-hexafluoropropylene)(PVDF-HFP)and lithiated X type zeolite(Li-X),which possesses a high ionic conductivity(1.98×10^(-4)S/cm),high lithium transference number(t_(Li^(+))=0.55),wide electrochemical window(4.7 V),and excellent stability against the lithium anode.Density functional theory(DFT)calculation confirms that the Lewis acid sites in zeolite can graft with N,N-dimethylformamide(DMF)and PVDF-HFP chains,resulting in decreased crystallinity of polymer and providing rapid Li+transmission channels.When used in a full cell,the solid Li|Li-X-3%|LiFePO_(4) cell displays excellent cycling stability and rate performance at room temperature and 60℃.Furthermore,pouch cells with the Li-X-3%electrolyte exhibit brilliant safety under extreme conditions,such as folding and cutting.Thus,this proposed zeolite-PVDF-HFP CPE represents a promising potential in the application of making a safer,higher performing,and Flexible solid-state lithium battery.

关键词： solid-state lithium batteries composite polymer electrolytes zeolite poly(vinylidene fluorideco-hexafluoropropylene)(PVDF-HFP) Flexible

Fabrication of plasmonic nanopyramidal array as Flexible SERS substrate for biosensing application

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Nano Research 2023年第1期16卷 1132-1140页

作者： Anindita Das Udit Pant Cuong Cao Rakesh SMoirangthem Hitesh Bhanudas Kamble Nanophotonics Lab Department of PhysicsIndian Institute of Technology(Indian School of Mines)Dhanbad-826004India Institute for Global Food Security School of Biological SciencesQueen’s University of Belfast19 Chlorine GardensBelfastBT95DLUK Material and Advanced Technologies for Healthcare Queen’s University of Belfast18-30 Malone RoadBelfastBT95BNUK IITB Nanofabrication Facility Department of Electrical EngineeringIndian Institute of TechnologyBombay-400076India

The proposed work aims to develop a sensitive surface-enhanced Raman spectroscopy(SERS)nano-biosensor.The inverted nano pyramid array on silicon substrate fabricated using electron beam lithography(EBL)was utilised as a master template and the mold was later replicated via nanoimprinting process to prepare gold-coated polymer nanopyramid three-dimensional(3D)SERS substrate.The fast and versatile replication process using nanoimprinting lithography(NIL)can produce polymer nanopyramids in a low-cost and reproducible fashion.Also,the proposed fabrication protocol can be easily upscale for large scale fabrication.The intense electric field confinement at nanotips and four edges of gold-coated polymer nanopyramid enhanced the Raman signal of probe molecules,i.e.,Rhodamine 6G with a limit of detection down to 3.277×10−9 M was achieved.This work also underlines the efficiency of gold-coated polymer nanopyramid arrays in the spectral detection of hemoglobin proteins at low concentrations.The Raman signal enhancement mechanism was further studied through the electromagnetic simulation using COMSOL Multiphysics.In addition,bending test experiments were performed to understand the effect of flexibility on SERS signal response.The fabricated gold-coated polymer nanopyramids arrays could pave the way for the development of low-cost SERS platforms for the detection of hazardous biological and chemical compounds at ultra-low concentrations in practical applications.

关键词： nanopyramids surface-enhanced Raman spectroscopy(SERS) Flexible hemoglobin protein nanoimprinting replica molding

Flexible broadband WS_(2)/Si optical position-sensitive detector with high sensitivity and fast speed

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International Journal of Minerals,Metallurgy and Materials 2023年第6期30卷 1217-1224页

作者： Yunjie Liu Yupeng Wu Fuhai Guo Yingming Liu Shirong Zhao Siqi Li Weizhuo Yu Lanzhong Hao College of Science China University of PetroleumQingdao 266580China School of Materials Science and Engineering China University of PetroleumQingdao 266580China

Si-based optical position-sensitive detectors(PSDs)have stimulated the interest of researchers due to their wide range of practical applications.However,due to the rigidity and fragility of Si crystals,the applications of Flexible PSDs have been limited.Therefore,we presented a Flexible broadband PSD based on a WS_(2)/Si heterostructure for the first time.A scalable sputtering method was used to deposit WS_(2)thin films onto the etched ultrathin crystalline Si surface.The fabricated Flexible PSD device has a broad spectral response in the wavelength range of 450-1350 nm,with a high position sensitivity of~539.8 mV·mm^(−1)and a fast response of 2.3μs,thanks to the strong light absorption,the built-in electrical field at the WS_(2)/Si interface,and facilitated transport.Furthermore,mechanical-bending tests revealed that after 200 mechanical-bending cycles,the WS_(2)/Si PSDs have excellent mechanical flexibility,stability,and durability,demonstrating the great potential in wearable PSDs with competitive performance.

关键词： Flexible position-sensitive detectors WS^(2)heterostructure broad spectral response high sensitivity

Flexible and densified graphene/waterborne polyurethane composite film with thermal conducting property for high performance electromagnetic interference shielding

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Nano Research 2022年第11期15卷 9926-9935页

作者： Wang Yang Hengxuan Bai Bo Jiang Chaonan Wang Weimin Ye Zhengxuan Li Chong Xu Xiaobai Wang Yongfeng Li State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing 102249China Department of Materials Application Research AVIC Manufacturing Technology InstituteBeijing 100024China

High-performance electromagnetic interference(EMI)shielding materials with flexibility,excellent mechanical property,and thermal conductivity are highly desired for fifth-generation communications devices.Graphene exhibits tremendous potential due to its high electrical conductivity and unique lamellar structure.However,the construction of densified graphene structure in polymer matrix is still challenging.Herein,we develop a graphene/waterborne polyurethane(G/WPU)Flexible film with densified and ordered layer-structure for using as an EMI shielding material.By virtue of the polyvinylpyrrolidone modified strategy and facile liquid phase ball-milling treatment,the graphene nanosheets can be efficiently dispersed into the WPU substrate and tightly connected between each other via internal interactions.Benefiting from the relatively low defects and densified structure of graphene,the resultant G/WPU film yields a high electrical conductivity of 1,004.5 S/m,and a tensile strength of around 48.5 MPa.As a consequence,it achieves an average EMI shielding effectiveness of over 30 dB in the X-band with a thickness of merely 0.15 mm and the value is further enhanced to 73.4 dB at 0.9 mm with a low density of 1.4 g/cm^(3),offering over 99.99999%shielding of incident electromagnetic waves.More importantly,this G/WPU film also exhibits a high cross-plane thermal conductivity of about 1.13 W/(m·K).Thus,this work develops a high-performance EMI shielding material with both good capacity of heat transmission,but also provides a facile strategy for designing next-generation advanced,lightweight,Flexible,and multifunction shielding materials.

关键词： electromagnetic interference shielding graphene densification Flexible thermal conductivity

High rate and ultralong life Flexible all-solid-state zinc ion battery based on electron density modulated NiCo_(2)O_(4) nanosheets

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Journal of Energy Chemistry 2022年第7期31卷 283-291,I0008页

作者： Wenda Qiu Yunlei Tian Zhenchao Lin Shuting Lin Zhangqi Geng Kaitao Huang Aihua Lei Fuchun Huang Huajie Feng Fengze Ding Yu Li Xihong Lu Guangdong Industry Polytechnic College Guangzhou 510300GuangdongChina MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry KLGHEI of Environment and Energy ChemistrySchool of ChemistrySun Yat-Sen UniversityGuangzhou 510275GuangdongChina Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province Hainan Normal UniversityHaikou 571158HainanChina

The development of zinc ion batteries (ZIBs) with large capacity,high rate,and durable cathode material is a crucial and urgent task.Ni Co_(2)O_(4)(NCO) has received ever-growing interest as a potential cathode material for ZIBs,owing to the high theoretical capacity,rich source,cost-effective,and versatile redox nature.However,due to the slow dynamics of the NCO electrodes,its practical application in highperformance systems is severely limited.Herein,we report an electron density modulated NCO nanosheets (N-NCO NSs) with high-kinetics Zn^(2+)-storage capability as an additive-free cathode for Flexible all-solid-state (ASS) ZIBs.By virtue of the enhanced electronic conductivity,improved reaction kinetics,and increased active sites,the optimized N-NCO NSs electrode delivers a high capacity of 357.7 m Ah g^(-1)at 1.0 A g^(-1)and a superior rate capacity of 201.4 m Ah g^(-1)at 20 A g^(-1).More importantly,a Flexible ASS ZIBs device is manufactured using a solid polymer electrolyte of a poly (vinylidene fluoride hexafluoropropylene)(PVDF-HFP) film.The Flexible ASS ZIBs device shows superb durability with 80.2%capacity retention after 20,000 cycles and works well in the range of-20–70℃.Furthermore,the Flexible ASS ZIBs achieves an impressive energy density as high as 578.1 W h kg^(-1)with a peak power density of 33.6 k W kg^(-1),substantially outperforming those latest ZIBs.This work could provide valuable insights for constructing high-kinetics and high-capability cathodes with long-term stability for Flexible ASS ZIBs.

关键词： Electron densities modulation NiCo_(2)O_(4)nanosheets All-solid-state Flexible Zinc ion batteries

Flexible Hf_(0.5)Zr_(0.5)O_(2)ferroelectric thin films on polyimide with improved ferroelectricity and high flexibility

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Nano Research 2022年第4期15卷 2913-2918页

作者： Yuting Chen Yang Yang Peng Yuan Pengfei Jiang Yuan Wang Yannan Xu Shuxian Lv Yaxin Ding Zhiwei Dang Zhaomeng Gao Tiancheng Gong Yan Wang Qing Luo Key Laboratory of Microelectronic Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China University of Chinese Academy of Sciences Beijing 100049China Department of Mathematics and Theories Peng Cheng LaboratoryNo.2Xingke 1st StreetNanshanShenzhen 518000China

Flexible memory devices are promising for information storage and data processing applications in portable,wearable,and smart electronics operating under curved conditions.In this work,we realized high-performance Flexible ferroelectric capacitors based on Hf_(0.5)Zr_(0.5)O_(2)(HZO)thin film by depositing a buffer layer of Al_(2)O_(3)on polyimide(PI)substrates using atomic layer deposition(ALD).The Flexible ferroelectric HZO films exhibit high remnant polarization(Pr)of 21μC/cm^(2).Furthermore,deterioration of polarization,retention,and endurance performance was not observed even at a bending radius of 2 mm after 5,000 bending cycles.This work marks a critical step in the development of high-performance Flexible HfO_(2)-based ferroelectric memories for next-generation wearable electronic devices.

关键词： ferroelectric Hf_(0.5)Zr_(0.5)O_(2)(HZO) Al_(2)O_(3)buffer layer Flexible

Flexible, self-cleaning, and high-performance ceramic nanofiber-based moist-electric generator enabled by interfacial engineering

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Science China(Technological Sciences) 2022年第2期65卷 450-457页

作者： WANG LiMing FENG LanLan SUN Zhao Yang HE XinYang WANG RongWu QIN XiaoHong YU JianYong Key Laboratory of Textile Science&Technology Ministry of EducationCollege of TextilesDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China

Due to their long-term stability, even under extreme conditions, oxide ceramics have attracted significant attention in emerging fields like moist-electric generation. However, the inherent brittleness and low voltage output of oxide ceramic-based moistelectric generators(MEGs) limit their applications in wearable electronics. Herein, a facile strategy involving the combination of sol-gel electrospinning and calcination is used to fabricate Flexible and freestanding Ti O_(2)/Zr O_(2)(TZ) composite nanofiber-based MEGs. The excellent flexibility of the TZ nanofiber membranes can be attributed to the suppression of their crystal structure transformation, dispersion of stress concentration, and reduction of crack propagation via interfacial engineering. The porous structure of the electrospun nanofiber membrane features an abundance of charged narrow channels for the diffusion of water molecules and generates a streaming potential. The optimal voltage output reached ~0.8 V, which is the highest value reported for an oxide ceramic-based MEG. Furthermore, the as-fabricated nanofiber-based MEG exhibits good self-cleaning capability to degrade organic pollutants under ultraviolet irradiation. By integrating mechanical flexibility, high performance, and a selfcleaning effect, this work presents a new idea for exploring diverse, efficient, and wearable oxide ceramic-based MEGs.

关键词： moist-electric generation ceramic nanofiber electrospinning Flexible self-cleaning