Sharp-Tip Silver Nanowires Mounted on Cantilevers for High-Aspect-Ratio High-Resolution Imaging

Ma, Xuezhi; Zhu, Yangzhi; Kim, Sanggon; Liu, Qiushi; Byrley, Peter; Yang, Wei; Zhang, Jin; Jiang, Kaili; Fan, Shoushan; Yan, Ruoxue; Liu, Ming

doi:10.1021/acs.nanolett.6b02802

Cited by 30 publications

(36 citation statements)

References 36 publications

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“…The shape, size and composition of such particles can be readily controlled with high homogeneity and on a large scale, making them ideal for plasmonic applications. 33 Additionally, they help to limit tipdegradation 34,35 as they exhibit superior mechanical properties compared to the corresponding bulk material. For example, the Young's modulus of silver nanowires can reach up to 160 GPa, 36 around 3 times greater than found in bulk.…”

Section: Introductionmentioning

confidence: 99%

Silver nanowires for highly reproducible cantilever based AFM-TERS microscopy: towards a universal TERS probe

et al. 2018

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Tip-enhanced Raman scattering (TERS) microscopy is a unique analytical tool to provide complementary chemical and topographic information of surfaces with nanometric resolution. However, difficulties in reliably producing the necessary metallized scanning probe tips has limited its widespread utilisation, particularly in the case of cantilever-based atomic force microscopy. Attempts to alleviate tip related issues using colloidal or bottom-up engineered tips have so far not reported consistent probes for both Raman and topographic imaging. Here we demonstrate the reproducible fabrication of cantilever-based high-performance TERS probes for both topographic and Raman measurements, based on an approach that utilises noble metal nanowires as the active TERS probe. The tips show 10 times higher TERS contrasts than the most typically used electrochemically-etched tips, and show a reproducibility for TERS greater than 90%, far greater than found with standard methods. We show that TERS can be performed in tapping as well as contact AFM mode, with optical resolutions around or below 15 nm, and with a maximum resolution achieved in tapping-mode of 6 nm. Our work illustrates that superior TERS probes can be produced in a fast and cost-effective manner using simple wet-chemistry methods, leading to reliable and reproducible high-resolution and high-sensitivity TERS, and thus renders the technique applicable for a broad community.

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Section: Introductionmentioning

confidence: 99%

Silver nanowires for highly reproducible cantilever based AFM-TERS microscopy: towards a universal TERS probe

et al. 2018

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“…The radiuses of those tips typically range from several nanometers to tens of nanometers, accumulating a large density of charges, resulting in a greatly enhanced EM field near to those tips with small volume. Scanning probe microscopes, such as atomic force microscope (AFM), and scanning tunneling microscope, are always used to provide the feedback to bring the sharp tips in contact with the samples [23,131,132]. The EM fields can be further enhanced by several orders in the gap modes formed between tips and metal substrates.…”

Section: Other Structuresmentioning

confidence: 99%

Engineering photonic environments for two-dimensional materials

Youngblood

Liu

et al. 2020

Nanophotonics

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A fascinating photonic platform with a small device scale, fast operating speed, as well as low energy consumption is two-dimensional (2D) materials, thanks to their in-plane crystalline structures and out-of-plane quantum confinement. The key to further advancement in this research field is the ability to modify the optical properties of the 2D materials. The modifications typically come from the materials themselves, for example, altering their chemical compositions. This article reviews a comparably less explored but promising means, through engineering the photonic surroundings. Rather than modifying materials themselves, this means manipulates the dielectric and metallic environments, both uniform and nanostructured, that directly interact with the materials. For 2D materials that are only one or a few atoms thick, the interaction with the environment can be remarkably efficient. This review summarizes the three degrees of freedom of this interaction: weak coupling, strong coupling, and multifunctionality. In addition, it reviews a relatively timing concept of engineering that directly applied to the 2D materials by patterning. Benefiting from the burgeoning development of nanophotonics, the engineering of photonic environments provides a versatile and creative methodology of reshaping light–matter interaction in 2D materials.

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“…This scheme substantially reduces the hydrodynamic damping of dynamic AFM by reducing contact cross-section with the liquid environment. In order to acquire a high-resolution topography image, it is essential to utilize a sharp and high aspect ratio AFM tip (Ma et al, 2016). The TR-AFM can oscillate in all three directions which involve a coupled bending-torsional motion of cantilever and bending of nanoneedle in two directions.…”

mentioning

confidence: 99%

Modeling of eccentric nanoneedle in trolling‐mode atomic force microscope

Chahari

Sajjadi

2020

Microscopy Res & Technique

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Limitations on installation of a standard TR-AFM nanoneedle can have unpredictable effects on dynamics of system. Therefore, it is crucial to pay close attention to the position and geometry of mounted nanoneedle when deriving the mathematical model. During TR-AFM fabrication process, the nanoneedle may not always deposit precisely at the middle of AFM tip, which would result in coupled bending-torsion modes in the dynamical operation of system. In this paper, we investigate the effect of eccentric nanoneedle in dynamic response of TR-AFM. To address this issue, a continuous mathematical model is developed. This model accounts for eccentric nanoneedle which can address the couplings in nonlinear vibration. Hamilton's principle is used to derive equations of motion and then assumed mode method (AMM) is utilized. This model is capable of simulating the cantilever dynamics under complicated nanoneedle tip-sample interactions. Displacements of different components of system for various eccentricity are determined. It is found that nanoneedle eccentricity has noticeable effects on microbeam torsion angle and out of plane nanoneedle tip displacement.

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Sharp-Tip Silver Nanowires Mounted on Cantilevers for High-Aspect-Ratio High-Resolution Imaging

Cited by 30 publications

References 36 publications

Silver nanowires for highly reproducible cantilever based AFM-TERS microscopy: towards a universal TERS probe

Silver nanowires for highly reproducible cantilever based AFM-TERS microscopy: towards a universal TERS probe

Engineering photonic environments for two-dimensional materials

Modeling of eccentric nanoneedle in trolling‐mode atomic force microscope

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