Electrochemical Growth of Single-Crystal Metal Nanowires via a Two-Dimensional Nucleation and Growth Mechanism

Nano Letters ◽  
2003 ◽  
Vol 3 (7) ◽  
pp. 919-923 ◽  
Author(s):  
Mingliang Tian ◽  
Jinguo Wang ◽  
James Kurtz ◽  
Thomas E. Mallouk ◽  
M. H. W. Chan
Keyword(s):  
Single Crystal ◽  
Growth Mechanism ◽  
Nucleation And Growth ◽  
Metal Nanowires ◽  
Two Dimensional ◽  
Electrochemical Growth ◽  
Nucleation And Growth Mechanism

scholarly journals A Tale of Two Transitions: Unraveling Two Distinct Polymorph Transition Mechanisms in One n-Type Single Crystal for Dynamic Electronics

2021 ◽  
Author(s):  
Daniel W. Davies ◽  
Sang Kyu Park ◽  
Stephen B. Shiring ◽  
Hyunjoong Chung ◽  
Prapti Kafle ◽  
...  
Keyword(s):  
Single Crystal ◽  
Growth Mechanism ◽  
High Performance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Nucleation And Growth ◽  
The Other ◽  
Resonance Spectroscopy ◽  
Other Hand ◽  
Nucleation And Growth Mechanism

Cooperativity is used by living systems to circumvent energetic and entropic barriers to yield highly efficient molecular processes. Cooperative structural transitions involve the simultaneous, concerted displacement of molecules in a crystalline material, in stark contrast to the more typical molecule-by-molecule nucleation and growth mechanism often breaking the single crystallinity. Cooperative transitions have acquired much attention in the research community for their low transition barriers, ultrafast kinetics, and structural reversibility. On the other hand, cooperative transitions are rarely observed in molecular crystals and the molecular origin is not well understood. Single crystals of 2-dimensional quinoidal terthiophene (2DQTT-o-B), a high-performance n-type organic semiconductor, demonstrate two thermally-activated, reversible phase transitions with one exhibiting a cooperative mechanism and the second exhibiting a nucleation and growth mechanism. In situ microscopy, single crystal and grazing incidence X-ray diffraction (GIXD), along with Raman spectroscopy suggest a reorientation of the alkyl side chains results in a cooperative transition behavior. On the other hand, the nucleation and growth transition is coincident with both side chain melting and the emergence of new spin-spin interactions between conjugated cores, confirmed through in situ electron paramagnetic resonance spectroscopy (EPR). This is the first observation of biradical interactions directly initiating a structural transition. Through studying these fundamental mechanisms, we establish alkyl chain conformation and disorder as integral to rationally controlling these polymorphic behaviors for novel electronic applications.

Formation of coherent twins in YBa2Cu3O7–δ superconductors

1989 ◽  
Vol 4 (4) ◽  
pp. 795-801 ◽  
Author(s):  
C. J. Jou ◽  
J. Washburn
Keyword(s):  
Oxygen Uptake ◽  
Growth Mechanism ◽  
Oxygen Uptake Rate ◽  
Nucleation And Growth ◽  
Electron Microscopic ◽  
Transmission Electron ◽  
Transmission Electron Microscopic ◽  
Twin Formation ◽  
Boundary Model ◽  
Nucleation And Growth Mechanism

A nucleation-and-growth mechanism for the twin formation in YBa2Cu3O7–δ superconductors based on the oxygen uptake rate curve and published transmission electron microscopic observations is proposed together with an oxygen-depleted twin boundary model. The difficulty of reaching stoichiometric YBa2Cu3O7 is explained.

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