Preparation of free-standing metal wire arrays by in situ assembly

ABSTRACTWe have studied the surface morphology of free standing single crystals of thermochromic polydiacetylenes (PDAs), namely, ETCD and IPUDO (respectively, the ethyl and isopropyl urethanes of 5,7-dodecadiyn-1,12-diol), by Atomic Force Microscopy (AFM) under ambient conditions. Micron scale as well as molecularly resolved images were obtained. The micron scale images indicate a variable surface, and the molecularly resolved images show a well defined 2-D lattice that is interpreted in terms of molecular models and known crystallographic data. Thereby information about surface morphology, which is crucial to potential optical device or chromic sensor performance is available. We also report the observation of a “macroscopic shattering” of the IPUDO monomer crystal during in-situ UV polymerization studies.

Download Full-text

Novel in situ self-separation of a 2 in. free-standing m-plane GaN wafer from an m-plane sapphire substrate by HCl chemical reaction etching in hydride vapor-phase epitaxy

CrystEngComm ◽

10.1039/c6ce00642f ◽

2016 ◽

Vol 18 (40) ◽

pp. 7690-7695

Author(s):

Seohwi Woo ◽

Sangil Lee ◽

Uiho Choi ◽

Hyunjae Lee ◽

Minho Kim ◽

...

Keyword(s):

Chemical Reaction ◽

Vapor Phase ◽

Sapphire Substrate ◽

Vapor Phase Epitaxy ◽

Hydride Vapor Phase Epitaxy ◽

Free Standing

A 2 in.-diameter free-standing m-plane GaN wafer was fabricated through in situ self-separation from m-plane sapphire using HCl chemical reaction etching (HCRE) in hydride vapor-phase epitaxy (HVPE).

Download Full-text

Mechanisms of Grain Growth in Free-Standing Nanograined Gold Thin Films

MRS Proceedings ◽

10.1557/proc-0907-mm06-03 ◽

2005 ◽

Vol 907 ◽

Cited By ~ 1

Author(s):

J. A. Gregg ◽

K Hattar ◽

C H Lei ◽

I M Robertson

Keyword(s):

Thin Films ◽

Grain Growth ◽

Structural Changes ◽

Dislocation Slip ◽

Free Standing ◽

Transmission Electron ◽

Enhanced Properties ◽

Gold Thin Films ◽

Annealing Experiments

AbstractRetention of the enhanced properties reported for nanograined metallic systems requires that the nanostructure be insensitive to temperature and deformation. In situ transmission electron microscopy annealing experiments were employed to investigate the structural changes associated with the formation of micron-sized grains in nanograined evaporated gold thin films. This abnormal grain growth occurs randomly throughout the film. Twinning but not dislocation slip occurs in the growing grains until the grain size is in the hundreds of nanometer range. The twins appear to hinder growth and for grain growth to continue the twins must either be annihilated or be able to grow with the grain concurrently.

Download Full-text

Fabrication and In Situ Transmission Electron Microscope Characterization of Free-Standing Graphene Nanoribbon Devices

ACS Nano ◽

10.1021/acsnano.5b06975 ◽

2016 ◽

Vol 10 (1) ◽

pp. 1475-1480 ◽

Cited By ~ 21

Author(s):

Qing Wang ◽

Ryo Kitaura ◽

Shoji Suzuki ◽

Yuhei Miyauchi ◽

Kazunari Matsuda ◽

...

Keyword(s):

Electron Microscope ◽

Transmission Electron Microscope ◽

Graphene Nanoribbon ◽

Free Standing ◽

Transmission Electron

Download Full-text

In-situ Grown Hierarchical MoS2 Nanoflakes on Three- Dimensional Carbon Fiber Papers as Free-Standing Anodes for Lithium-Ion Battery

International Journal of Electrochemical Science ◽

10.20964/2019.09.31 ◽

2019 ◽

pp. 8662-8675 ◽

Cited By ~ 1

Author(s):

Hongjie Li ◽

Keyword(s):

Carbon Fiber ◽

Lithium Ion Battery ◽

Three Dimensional ◽

Lithium Ion ◽

Free Standing

Download Full-text

In-situ construction of metal organic frameworks derived Co/Zn–S sandwiched graphene film as free-standing electrodes for ultra-high energy density supercapacitors

Journal of Power Sources ◽

10.1016/j.jpowsour.2020.227772 ◽

2020 ◽

Vol 451 ◽

pp. 227772 ◽

Cited By ~ 17

Author(s):

Na Xin ◽

Yu Liu ◽

Haoting Niu ◽

Hongye Bai ◽

Weidong Shi

Keyword(s):

Energy Density ◽

Metal Organic Frameworks ◽

Graphene Film ◽

High Energy ◽

High Energy Density ◽

Ultra High Energy ◽

Free Standing ◽

Metal Organic

Download Full-text

In situ TEM Straining of Nanograined Al Films Strengthened with Al2O3 Nanoparticles

MRS Proceedings ◽

10.1557/proc-1262-v01-04 ◽

2010 ◽

Vol 1262 ◽

Author(s):

Khalid Hattar ◽

Blythe G. Clark ◽

James A Knapp ◽

David M Follstaedt ◽

I. M. Robertson

Keyword(s):

In Situ Tem ◽

Al2o3 Nanoparticles ◽

Particle Sizes ◽

Free Standing ◽

Active Deformation ◽

Deformation And Failure ◽

Annealing Conditions ◽

Thermal Histories ◽

Initial Results

AbstractGrowing interest in nanomaterials has raised many questions regarding the operating mechanisms active during the deformation and failure of nanoscale materials. To address this, a simple, effective in situ TEM straining technique was developed that provides direct detailed observations of the active deformation mechanisms at a length scale relevant to most nanomaterials. The capabilities of this new straining structure are highlighted with initial results in pulsed laser deposited (PLD) Al-Al2O3 thin films of uniform thickness. The Al-Al2O3 system was chosen for investigation, as the grain size can be tailored via deposition and annealing conditions and the active mechanisms in the binary system can be compared to previous studies in PLD Ni and evaporated Al films. PLD Al-Al2O3 free-standing films of various oxide concentrations and different thermal histories were produced and characterized in terms of average grain and particle sizes. Preliminary in situ TEM straining experiments show intergranular failure for films with 5 vol% Al2O3. Further work is in progress to explore and understand the active deformation and failure mechanisms, as well as the dependence of mechanisms on processing routes.

Download Full-text