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Plasma-induced nanowelding of a copper nanowire network and its application in transparent electrodes and stretchable conductors

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Nano Research 2016年第7期9卷 2138-2148页

作者： Ranran Wang Haitao Zhai Tao Wang Xiao Wang Yin Cheng Liangjing Shi Jing Sun The State Key Lab of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy ot Sciences 1295 Dingxi Road Shanghai 200050 China

Copper nanowires （Cu NWs） have attracted increasing attention as building blocks for electronics due to their outstanding electrical properties and low cost. However, organic residues and oxide layers ubiquitously existing on the surface of Cu NWs impede good inter-wire contact. Commonly used methods such as thermal annealing and acid treatment often lead to nanowire damage. Herein, hydrogen plasma treatment at room temperature has been demonstrated to be effective for simultaneous surface cleaning and selective welding of Cu NWs at junctions. Transparent electrodes with excellent optical-electrical performance （19 ff）-sq-1 @ 90% T） and enhanced stability have been fabricated and integrated into organic solar cells. Besides, Cu NW conductors with superior stretchability and cycling stability under stretching speeds of up to 400 mm-min-＇ can also be produced by the nanowelding process, and the feasibility of their application in stretchable LED circuits has been demonstrated.

关键词： plasma nanowelding transparent electrode stretchable conductor organic solar cell

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External field-strengthened Ostwald nanowelding

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Nano Research 2022年第5期15卷 4525-4535页

作者： Moxia Li Xi Xie Yaomengli Xu Jianfang Liu Yanan Fu Mei Han Xucheng Li Xidong Duan Changjun Min Jiawen Hu Hunan Key Laboratory of Two-Dimensional Materials Advanced Catalytic Engineering Research Center of the Ministry of Educationand College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information Technology&Institute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China State Key Laboratory for Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen 361005China

The accomplishment of nanowelding typically requires the input of high energy,possibly causing appreciable damages to the brittle ***,we report an external field(EF,i.e.,light,direct current(DC),and alternating current(AC))-strengthened Ostwald nanowelding(ONW)strategy to enable low-temperature nanowelding of Au nanoparticles(NPs)with nanoscale spacing in solution and propose an electron localization mechanism to understand *** reveal that the EF-derived local electrons not only greatly strengthen the dissolution of surface atoms and the reduction of Au3+ions dissolved,but also confine(together with ordered water molecules)the transport of Au^(3+)ions within the ***,the electrochemical Ostwald ripening(OR)process of the Au NPs is actively strengthened,which,along with the local electron-strengthened surface atom diffusion(as a result of the strong electrostatic repulsion created),enables feasible ONW for solution processing of interdigital electrodes(IDEs)from Au NPs and high-performance transparent conductor(TC)from Ag nanowires(NWs).Our low-temperature nanowelding strategy offers an efficient interconnection technique for the processing of functional nanodevices from individual nanomaterials.

关键词： external field(EF) Ostwald ripening(OR) nanowelding Au nanoparticle(NP) Ag nanowire(NWs)

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Bottom-up fabrication of three-dimensional nanoporous gold from Au nanoparticles using nanowelding

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Science China Materials 2022年第10期65卷 2755-2762页

作者： Moxia Li Yaomengli Xu Bingwu Liu Jianfang Liu Xuguang Sun Dongmei Deng Xidong Duan Jiawen Hu Hunan Key Laboratory of Two-Dimensional Materials Advanced Catalytic Engineering Research Center of the Ministry of EducationCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China

Three-dimensional(3D)nanoporous gold(NPG)shows promising applications in various ***,its most common fabrication strategy(i.e.,dealloying)faces the problems of high energy consumption,resource waste,the use of corrosive solvent,and residue of the sacrificial ***,we report a general bottom-up nanowelding strategy to fabricate high-purity NPG from Au nanoparticles(NPs),accomplished via interfacial self-assembly of the Au NPs into monolayer Au NP film,its subsequent layer-by-layer transfer onto a solid substrate,and direct current(DC)*** show that the DC nanowelding process can gradually evolve the layered Au NP film into NPG at low temperatures within 10 s,while not damaging their spherical *** is because during the nanowelding,electrons are preferred to be localized at the high-resistance NP/NP junctions,whose electrostatic repulsion in turn strengthens their surface atom diffusion to initiate a mild solid-state diffusion ***,when using differently sized Au NPs as the starting building blocks,this strategy allows readily tuning the thickness,ligament size,and pore size,thereby offering great flexibility to create functional porous nanomaterials,e.g.,electrocatalyst for methanol ***,low-temperature nanowelding can play a role for the production of diverse nanoporous materials from other NPs beyond Au NPs.

关键词： nanoporous gold nanowelding Au nanoparticles surface atom diffusion electrocatalyst

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Large scale silver nanowires network fabricated by MeV hydrogen (H＋) ion beam irradiation

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Chinese Physics B 2016年第4期25卷 268-273页

作者： Honey S Naseem S Ishaq A Maaza M Bhatti M T Wan D Center of Excellence in Solid State Physics University of the Punjab Lahore Pakistan National Center for Physics Quaid-i-Azam University Islamabad 44000 Pakistan UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology College of Graduate Studies University of South Africa Muckleneuk ridge P. O. Box 392 Pretoria South Africa Nanosciences African Network (NANOAFNET) iThemba LABS National Research Foundation Old Faure road P. O. Box 722 Somerset West 7129 South Africa Department of Physics Bahauddin Zakariya University Multan 60800 Pakistan School of Materials Science and Engineering Shanghai University Shanghai 201900 China

A random two-dimensional large scale nano-network of silver nanowires （Ag-NWs） is fabricated by MeV hydrogen （H＋） ion beam irradiation. Ag-NWs are irradiated under H＋ ion beam at different ion fluences at room temperature. The Ag-NW network is fabricated by H＋ ion beam-induced welding of Ag-NWs at intersecting positions. H＋ ion beam induced welding is confirmed by transmission electron microscopy （TEM） and scanning electron microscopy （SEM）. Moreover, the structure of Ag NWs remains stable under H＋ ion beam, and networks are optically transparent. Morphology also remains stable under H＋ ion beam irradiation. No slicings or cuttings of Ag-NWs are observed under MeV H＋ ion beam irradiation. The results exhibit that the formation of Ag-NW network proceeds through three steps： ion beam induced thermal spikes lead to the local heating of Ag-NWs, the formation of simple junctions on small scale, and the formation of a large scale network. This observation is useful for using Ag-NWs based devices in upper space where protons are abandoned in an energy range from MeV to GeV. This high-quality Ag-NW network can also be used as a transparent electrode for optoelectronics devices.

关键词： Ag nanowires H+ ion irradiation nanowelding large scale nano-network optical properties

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Joining of Individual Silver Nanowires via Electrical Current

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Nano-Micro Letters 2014年第4期6卷 293-300页

作者： Arash Vafaei Anming Hu Irene A.Goldthorpe Department of Electrical and Computer Engineering University of Waterloo Department of Mechanical and Mechatronics Engineering University of Waterloo Department of Mechanical Aerospace and Biomedical Engineering University of Tennessee Knoxville

A procedure for joining polyol-synthesized silver nanowires in air using current-induced Joule heat welding is reported. Using a common probe station and photolithographically patterned gold electrodes, the welding process is completed using a common semiconductor analyzer. A unique two-step procedure eliminates the dielectric barrier at the point of contact without damaging the nanowires away from the junction. This procedure is designed for metal–metal contacts where a strong dielectric intermediate layer might exist, which can occur with metals prone to oxidation or corrosion in air, or as a result of the electrode deposition process. Ohmic connections are also established in cases where there is an initial gap between two nanowires.

关键词： Nanowires nanowelding Joule heating

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