Electron-Beam-Induced Elastic–Plastic Transition in Si Nanowires

Dai, Sheng; Zhao, Jiong; Xie, Lin; Cai, Yuan; Wang, Naiyan; Zhu, Jing

doi:10.1021/nl3003528

Cited by 62 publications

(53 citation statements)

References 45 publications

(62 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By taking advantage of the electron beam irradiation, unusual mechanical properties can be approached. 37,109,110 However, with an overdose of this radiation, significant irradiation effects will be integrated with the intrinsic physical properties of these materials. When conducting in situ experimental microscopy mechanics or physics investigations by assigning the fast electrons to interact with the observed objects, we have to obtain a balance between 'watching' and 'damaging' (overdosing).…”

Section: Summary and Perspectivesmentioning

confidence: 99%

In situ experimental mechanics of nanomaterials at the atomic scale

2013

View full text Add to dashboard Cite

Sub-micron and nanostructured materials exhibit high strength, ultra-large elasticity and unusual plastic deformation behaviors. These properties are important for their applications as building blocks for the fabrication of nano-and micro-devices as well as for their use as components for composite materials, high-strength structural and novel functional materials. These nano-related deformation and mechanical behaviors, which are derived from possible size and dimensional effects and the low density of defects, are considerably different from their conventional bulk counterparts. The atomic-scale understanding of the microstructural evolution process of nanomaterials when they are subjected to external stress is crucial for understanding these 'unusual' phenomena and is important for designing new materials, novel structures and applications. This review presents the recent developments in the methods, techniques, instrumentation and scientific progress for atomic-scale in situ deformation dynamics on nanomaterials, including nanowires, nanotubes, nanocrystals, nanofilms and polycrystalline nanomaterials. The unusual dislocation initiation, partial-full dislocation transition, crystalline-amorphous transitions and fracture phenomena related to the experimental mechanics of the nanomaterials are reviewed. Current limitations and future aspects using in situ high-resolution transmission electron microscopy of nanomaterials are also discussed. A new research field of in situ experimental mechanics at the atomic scale is thus expected. Keywords: atomic scale; dislocation; experimental mechanics; in situ; nanomaterial; twin INTRODUCTION Recent studies on nanostructured materials, including nanowires (NWs), 1,2 nanotubes (NTs), 1,3 nanocrystals (NC), 4 micro/nanopillars (NPs) 5-7 and nanocrystalline, 8,9 have revealed a variety of 'unusual deformation' phenomena compared with their bulk counterparts, such as high strength, nano-piezoelectric effects and unusual plastic deformation behaviors. Nanostructured materials can apparently sustain a larger dynamic range of elastic and plastic strains than conventional materials. The results from these studies indicate that the fundamental dislocation processes that initiate and sustain plastic flow and fracture in nanoscale materials are considerably different than in their conventional bulk counterparts. These 'unusual' phenomena not only allow these materials to possess excellent mechanical properties but also enable the tuning of their band structures and related novel electronic, magnetic, optical, photonic and catalytic properties. Revealing the atomic-scale deformation mechanisms of nanomaterials (NM) and controlling their elastic and plastic properties are useful for realizing the desired mechanical, physical and chemical properties through the application of stress or strain.Although extensive studies have been conducted to investigate the mechanical properties of NM, 10 the majority of the atomic

show abstract

Section: Summary and Perspectivesmentioning

confidence: 99%

In situ experimental mechanics of nanomaterials at the atomic scale

2013

View full text Add to dashboard Cite

show abstract

“…[4][5][6] For example, electron irradiation produces unusual mechanical changes because the reformation of chemical bonds considerably alters the plasticity of nanomaterials. 7,8 By increasing the electron energy that is released to an atomic lattice, even more fascinating structural changes have been obtained: Metaltipped semiconductor nanorods have been converted into shell-like structures, for instance. 9,10 Irradiated nanomaterials, thus, provide an interesting playground for studying how direct atomic displacements and electronic excitations lead to the formation of defects, chemical disordering, phase segregation/ordering, or spinodal decomposition, in an effort to gain control over the fabrication of more and more complex nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Phase transformation of PbSe/CdSe nanocrystals from core-shell to Janus structure studied by photoemission spectroscopy

et al. 2013

View full text Add to dashboard Cite

Photoelectron spectroscopic measurements have been performed, with synchrotron radiation on PbSe/CdSe heteronanocrystals that initially consist of core-shell structures. The study of the chemical states of the main elements in the nanocrystals shows a reproducible and progressive change in the valence-band and core-level spectra under photon irradiation, whatever the core and shell sizes are. Such chemical modifications are explained in light of transmission electron microscopy observations and reveal a phase transformation of the nanocrystals: The core-shell nanocrystals undergo a morphological change toward a Janus structure with the formation of semidetached PbSe and CdSe clusters. Photoelectron spectroscopy gives new insight into the reorganization of the ligands anchored at the surface of the nanocrystals and the modification of the electronic structure of these heteronanocrystals.

show abstract

“…The melting point of a material can be used to quantify temperature, but this is typically only a single-point or singletemperature detection [4][5][6][7] , especially when trying to measure the temperature of individual small particles. As environmental interactions become more accessible through modern in situ TEM instrumentation, it is essential to distinguish temperature effects from other electron beam effects 11,12 .…”

mentioning

confidence: 99%

Vanadium dioxide nanowire-based microthermometer for quantitative evaluation of electron beam heating

et al. 2014

View full text Add to dashboard Cite

Temperature measurement is critical for many technological applications and scientific experiments, and different types of thermometers have been developed to detect temperature at macroscopic length scales. However, quantitative measurement of the temperature of nanostructures remains a challenge. Here, we show a new type of microthermometer based on a vanadium dioxide nanowire. Its mechanism is derived from the metal-insulator transition of vanadium dioxide at 68°C. As our results demonstrate, this microthermometer can serve as a thermal flow meter to investigate sample heating from the incident electron beam using a transmission electron microscope. Owing to its small size the vanadium dioxide nanowire-based microthermometer has a large measurement range and high sensitivity, making it a good candidate to explore the temperature environment of small spaces or to monitor the temperature of tiny, nanoscale objects.

show abstract

Electron-Beam-Induced Elastic–Plastic Transition in Si Nanowires

Cited by 62 publications

References 45 publications

In situ experimental mechanics of nanomaterials at the atomic scale

In situ experimental mechanics of nanomaterials at the atomic scale

Phase transformation of PbSe/CdSe nanocrystals from core-shell to Janus structure studied by photoemission spectroscopy

Vanadium dioxide nanowire-based microthermometer for quantitative evaluation of electron beam heating

Contact Info

Product

Resources

About