Layer uniformity of glancing angle deposition

Wang, Jianguo; Shao, Jianda; Yao, Kui; Zhang, Fan

doi:10.1016/j.vacuum.2004.12.019

Cited by 9 publications

(6 citation statements)

References 9 publications

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“…While the spot-to-spot, substrate-to-substrate, and batch-to-batch variabilities are quite small, we are continuing to investigate the source of this variation to make further improvements. Experimental variables such as the presence of other deposited materials and the substrate location (i.e., distance from the metal source) have been identified as factors that also affect the SERS activity …”

Section: Resultsmentioning

confidence: 99%

The Use of Aligned Silver Nanorod Arrays Prepared by Oblique Angle Deposition as Surface Enhanced Raman Scattering Substrates

et al. 2008

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Aligned Ag nanorod arrays have been fabricated on glass substrates using an oblique angle vapor deposition (OAD) method. The surface morphology and structure of the Ag rods were studied by scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. Individual nanorods were found to be primarily cylindrical, albeit with irregularly shaped surface protrusions of the rods. The surface enhanced Raman scattering (SERS) response as a function of nanorod length was investigated using trans-1,2-bis(4pyridyl)ethene as a probe molecule at an excitation wavelength of 785 nm. The enhancement factors reached a maximum of ∼5 × 10 8 as the nanorod length approached 868 nm and then decreased to ∼3 × 10 6 as the nanorod length increased further to 1900 nm. For the 868 nm nanorod array, signals collected over multiple spots within the same substrate resulted in a relative standard deviation (RSD) of 10%, while an RSD of 15% was measured in signals collected from different substrates. When stored in a food vacuum bag, the substrates are stable with respect to SERS intensity for greater than 2 months. This study demonstrates that the OAD Ag nanorod arrays are highly sensitive, uniform, and stable SERS substrates that are suitable for a variety of surface chemical analysis applications.

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Section: Resultsmentioning

confidence: 99%

The Use of Aligned Silver Nanorod Arrays Prepared by Oblique Angle Deposition as Surface Enhanced Raman Scattering Substrates

et al. 2008

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“…The cross-sectional dimensions of the substrate were 21 mm×23 mm. The OAD and SBD methods usually produce thin films with uniformity at these length scales 29 . The deposition rate was typically 0.3 nm s − 1 .…”

Section: Methodsmentioning

confidence: 99%

Biologically inspired achromatic waveplates for visible light

Jen

Lakhtakia

et al. 2011

Nat Commun

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Waveplates are planar devices used in optics and optoelectronics to change the polarization state of light. made of anisotropic dielectric materials such as crystals and thin films, waveplates are not known to exhibit achromatic performance over the visible regime. Inspired by the microvillar structure of R8 cells functioning as polarization converters in the eyes of stomatopod crustaceans, we conceived, designed, fabricated and tested periodically multilayered structures comprising two different types of arrays of nanorods. morphologically analogous to the ocular cells, here we show that the periodically multilayered structures can function as achromatic waveplates over the visible regime.

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“…[43][44] Effective distance between the source and substrate in our fabrication chamber was maintained at $35 cm. The effect of source to substrate distance is beyond the scope of this work and will be pursued in a forthcoming communication.…”

Section: Hydrophilic/hydrophobic Probe Molecules and Wetting Behaviormentioning

confidence: 99%

“…It is also to be noted that the change in distance between source and substrate inside the evaporation chamber can bring variation in signal intensity, and this primarily could be attributed to the variation in nanorod length and morphology. [43][44] Effective distance between the source and substrate in our fabrication chamber was maintained at $35 cm. The effect of source to substrate distance is beyond the scope of this work and will be pursued in a forthcoming communication.…”

Section: Hydrophilic/hydrophobic Probe Molecules and Wetting Behaviormentioning

confidence: 99%

Long-Standing Stability of Silver Nanorod Array Substrates Functionalized Using a Series of Thiols for a SERS-Based Sensing Application

Shin

Lee

et al. 2016

Appl Spectrosc

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Silver nanorod (AgNR) array substrates were fabricated using an oblique angle thermal evaporation technique; their long-term stability, surface uniformity and reproducibility, which are primary requirements for their widespread realistic application and commercialization, were assessed using surface-enhanced Raman scattering (SERS) spectroscopy. The nanorod surfaces were functionalized using a series of organic thiols, which range from hydrophilic to hydrophobic, to mimic various conditions that often arise during detection of hydrophilic/phobic analytes in a realistic application field. A group of these functionalized substrates was stored in ambient laboratory atmosphere; another in light minimized, moisture-free vacuum; while another was stowed carefully and neatly in water to mimic realistic conditions. The effects of these storing conditions were studied. A surfactant was added to the water to maintain consistent surface wetting in the third group. SERS spectra of nanorod substrates prior to functionalization were also recorded to investigate the effect of adventitious carbonaceous contaminants. A meticulous systematic study on the reproducibility of SERS signals was carried out: spot-to-spot, substrate-to-substrate, batch-to-batch, day-to-day. The relative standard deviation (RSD) shown by the SERS signals acquired from various spots of a single substrate was less than 3%, which is very similar to the only account reported so far, in which RSD is reported as 2%. The wetting behavior of these thiol functionalized AgNR substrates are investigated using static contact angle measurements. The functionalized substrates have exhibited excellent long-standing stability over a period of six months when stored appropriately; hence, they are highly suitable for mass production towards realistic application.

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Layer uniformity of glancing angle deposition

Cited by 9 publications

References 9 publications

The Use of Aligned Silver Nanorod Arrays Prepared by Oblique Angle Deposition as Surface Enhanced Raman Scattering Substrates

The Use of Aligned Silver Nanorod Arrays Prepared by Oblique Angle Deposition as Surface Enhanced Raman Scattering Substrates

Biologically inspired achromatic waveplates for visible light

Long-Standing Stability of Silver Nanorod Array Substrates Functionalized Using a Series of Thiols for a SERS-Based Sensing Application

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