From Microjoining to Nanojoining

Abstract

Abstract:A review is provided of the recent advances and challenges in nanojoining, as compared to microjoining and even regular joining processes. Nanojoining examples are given and analyzed in various joining categories such as solidstate bonding, soldering/brazing and fusion welding. Proposed strategies for nanoassembly and nanojoining, e.g., selforganization and inkjet printing, are also highlighted.

Joining of Silver Nanomaterials at Low Temperatures: Processes, Properties, and Applications

“…Roughly, they can be classified into three major types based on the physical states of the parts to be joined: fusion welding, soldering/brazing, and solid-state bonding 9 . In general, fusion welding processes involve high local heat input and high temperatures using various energy sources, including laser [10][11][12] , electron beam 13 , electrical resistance 14 , plasma 15 , microwave [16][17][18] and chemical reaction 19 , to cause local melting and coalescence of the base building blocks.…”

Nanostructure evolution in joining of Al and Fe nanoparticles with femtosecond laser irradiation

“…INTRODUCTION Recently, rapid progress in nanoscience and nanotechnology has generated a high demand for techniques that can be used for the joining of nanoscale building blocks to facilitate the assembly of systems having complex functionality. 1,2 The joining of nanoparticles (NPs) is basic to this developing technology and is fundamental in the integration of nanoscale products. An important aspect of joining at the nano-scale is the maintenance of control over the melting depth in NPs.…”

“…4 Irradiation with fs laser pulses minimizes bulk heating effects and offers new promise in the nanofabrication of novel nanodevices and multifunctional molecular systems. 1,3 Since the fs laser pulse width is much shorter than the electron lattice thermal coupling time, excited electrons do not transfer energy to the lattice during the laser pulse. As a result, surface melting occurs and there is little heating or damage to the core of the particle.…”

Nano brazing of Pt-Ag nanoparticles under femtosecond laser irradiation

“…Further down the road of miniaturization to nanoscale, there is an emerging need to join nanoobjects to form nanoscale devices and systems [1][2][3]. Nanoparticles are regarded as important parts of nanoscale devices, which make joining nanoparticles necessary as a basic integration process in nanoscale products.…”

“…Use of a femtosecond laser can result in an ultrafast and nonthermal melting of solid materials with precisely controlled energy, which is promising for developing nano brazing/soldering junctions for nano-and/or molecular devices [2]. Only a few research works have focused on this area [5], since most of the nanojoining processes were only developed in the past decade and the concept of nanojoining was just proposed very recently [2]. In the present study, an effective and controlled manner of using a femtosecond laser to produce nano brazing joints was demonstrated and the joints were characterized in detail by transmission electron microscope (TEM).…”