Building two-dimensional materials one row at a time: Avoiding the nucleation barrier

Science ◽  
2018 ◽  
Vol 362 (6419) ◽  
pp. 1135-1139 ◽  
Author(s):  
Jiajun Chen ◽  
Enbo Zhu ◽  
Juan Liu ◽  
Shuai Zhang ◽  
Zhaoyang Lin ◽  
...  
Keyword(s):  
Nucleation Theory ◽  
Classical Nucleation Theory ◽  
Free Energy Barrier ◽  
Two Dimensional ◽  
Force Microscopy ◽  
Nucleation Barrier ◽  
Atomic Force ◽  
Wide Range ◽  
Two Dimensional Materials ◽  
Dynamics Simulations

Assembly of two-dimensional (2D) molecular arrays on surfaces produces a wide range of architectural motifs exhibiting unique properties, but little attention has been given to the mechanism by which they nucleate. Using peptides selected for their binding affinity to molybdenum disulfide, we investigated nucleation of 2D arrays by molecularly resolved in situ atomic force microscopy and compared our results to molecular dynamics simulations. The arrays assembled one row at a time, and the nuclei were ordered from the earliest stages and formed without a free energy barrier or a critical size. The results verify long-standing but unproven predictions of classical nucleation theory in one dimension while revealing key interactions underlying 2D assembly.

scholarly journals Tip-Based Nanomachining on Thin Films: A Mini Review

2021 ◽  
Author(s):  
Shunyu Chang ◽  
Yanquan Geng ◽  
Yongda Yan
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Data Storage ◽  
Three Dimensional ◽  
Maintenance Cost ◽  
Two Dimensional ◽  
Force Microscopy ◽  
Atomic Force ◽  
Current State ◽  
Two Dimensional Materials

AbstractAs one of the most widely used nanofabrication methods, the atomic force microscopy (AFM) tip-based nanomachining technique offers important advantages, including nanoscale manipulation accuracy, low maintenance cost, and flexible experimental operation. This technique has been applied to one-, two-, and even three-dimensional nanomachining patterns on thin films made of polymers, metals, and two-dimensional materials. These structures are widely used in the fields of nanooptics, nanoelectronics, data storage, super lubrication, and so forth. Moreover, they are believed to have a wide application in other fields, and their possible industrialization may be realized in the future. In this work, the current state of the research into the use of the AFM tip-based nanomachining method in thin-film machining is presented. First, the state of the structures machined on thin films is reviewed according to the type of thin-film materials (i.e., polymers, metals, and two-dimensional materials). Second, the related applications of tip-based nanomachining to film machining are presented. Finally, the current situation of this area and its potential development direction are discussed. This review is expected to enrich the understanding of the research status of the use of the tip-based nanomachining method in thin-film machining and ultimately broaden its application.

Corrigendum to “Atomic force microscopy for two-dimensional materials: A tutorial review” [Opt. Commun. 406 (2018) 3–17]

2018 ◽  
Vol 421 ◽  
pp. 134
Author(s):  
Hang Zhang ◽  
Junxiang Huang ◽  
Yongwei Wang ◽  
Rui Liu ◽  
Xiulan Huai ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Two Dimensional ◽  
Force Microscopy ◽  
Atomic Force ◽  
Two Dimensional Materials

scholarly journals Towards an Understanding of Crystallization by Attachment

Crystals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 463
Author(s):  
Haihua Pan ◽  
Ruikang Tang
Keyword(s):  
Capillary Condensation ◽  
Force Measurements ◽  
Force Microscopy ◽  
Physical Conditions ◽  
Driving Mechanisms ◽  
Atomic Force ◽  
Wide Range ◽  
Dynamics Simulations ◽  
Hydration Layers

Crystallization via particle attachment was used in a unified model for both classical and non-classical crystallization pathways, which have been widely observed in biomimetic mineralization and geological fields. However, much remains unknown about the detailed processes and driving mechanisms for the attachment. Here, we take calcite crystal as a model mineral to investigate the detailed attachment process using in situ Atomic Force Microscopy (AFM) force measurements and molecular dynamics simulations. The results show that hydration layers hinder the attachment; however, in supersaturated solutions, ionic bridges are formed between crystal gaps as a result of capillary condensation, which might enhance the aggregation of calcite crystals. These findings provide a more detailed understanding of the crystal attachment, which is of vital importance for a better understanding of mineral formation under biological and geological environments with a wide range of chemical and physical conditions.

scholarly journals A benzoxazine surfactant exchange for atomic force microscopy characterization of two dimensional materials exfoliated in aqueous surfactant solutions

RSC Advances ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 3222-3228 ◽  
Author(s):  
Tao Wang ◽  
Matthew D. J. Quinn ◽  
Shannon M. Notley
Keyword(s):  
Atomic Force Microscopy ◽  
Two Dimensional ◽  
Force Microscopy ◽  
Atomic Force ◽  
Surfactant Solutions ◽  
Two Dimensional Materials ◽  
Liquid Phase Exfoliation ◽  
Microscopy Characterization ◽  
Atomic Force Microscopy Characterization

Surfactant exchange was utilized to successfully deposit 2D flakes from liquid phase exfoliation for AFM characterization.

Atomic force microscopy for two-dimensional materials: A tutorial review

2018 ◽  
Vol 406 ◽  
pp. 3-17 ◽  
Author(s):  
Hang Zhang ◽  
Junxiang Huang ◽  
Yongwei Wang ◽  
Rui Liu ◽  
Xiulan Huai ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Two Dimensional ◽  
Force Microscopy ◽  
Atomic Force ◽  
Two Dimensional Materials

Studies of Nanomechanical Properties of Pulsed Laser Deposited NbN films on Si Using Nanoindentation

2012 ◽  
Vol 1424 ◽  
Author(s):  
M. A. Mamun ◽  
A. H. Farha ◽  
Y. Ufuktepe ◽  
H. E. Elsayed-Ali ◽  
A. A. Elmustafa
Keyword(s):  
Thin Films ◽  
Pulsed Laser ◽  
Niobium Nitride ◽  
X Ray Diffraction ◽  
Si Substrate ◽  
Force Microscopy ◽  
Atomic Force ◽  
Wide Range ◽  
Pile Up ◽  
Average Modulus

ABSTRACTNanomechanical and structural properties of pulsed laser deposited niobium nitride thin films were investigated using X-ray diffraction, atomic force microscopy, and nanoindentation. NbN film reveals cubic δ-NbN structure with the corresponding diffraction peaks from the (111), (200), and (220) planes. The NbN thin films depict highly granular structure, with a wide range of grain sizes that range from 15-40 nm with an average surface roughness of 6 nm. The average modulus of the film is 420±60 GPa, whereas for the substrate the average modulus is 180 GPa, which is considered higher than the average modulus for Si reported in the literature due to pile-up. The hardness of the film increases from an average of 12 GPa for deep indents (Si substrate) measured using XP CSM and load control (LC) modes to an average of 25 GPa measured using the DCM II head in CSM and LC modules. The average hardness of the Si substrate is 12 GPa.

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