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Search Publications by: Sergiy Krylyuk (Fed)

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Displaying 51 - 75 of 84

Probing the Optical Properties and Strain-Tuning of Ultrathin Mo1-xWxTe2

March 21, 2018
Author(s)
Ozgur B. Aslan, Isha M. Datye, Michal J. Mleczko, Karen Lau, Sergiy Krylyuk, Alina Bruma, Irina Kalish, Albert Davydov, Eric Pop, Tony F. Heinz
Ultrathin transition metal dichalcogenides (TMDCs) have recently been extensively investigated to understand their electronic and optical properties. Here we study ultrathin Mo0.91W0.09Te2, a semiconducting alloy of MoTe2, using Raman, photoluminescence

Electrochemical Detection of Acetaminophen with Silicon Nanowires

February 8, 2018
Author(s)
Raja Ram Pandey, Hussain S. Alshahrani, Sergiy Krylyuk, Elissa Williams, Albert Davydov, Charles C. Chusuei
Acetaminophen (APAP) is an antipyretic, analgesic agent. Overdose during medical treatment poses a risk for liver failure. Hence, it is important to develop methods to monitor APAP in the body to avoid APAP toxicity. Here, we report an efficient and

Nanoscale Heterogeneities in Monolayer MoSe2 Revealed by Correlated Scanning Probe Microscopy and Tip-Enhanced Raman Spectroscopy

December 26, 2017
Author(s)
Albert Davydov, Sergiy Krylyuk, Payam Taheri, Kirby K. Smithe, Andrey V. Krayev, Connor S. Bailey, Hye R. Lee, Eilam Yalon, Ozgur B. Aslan, Miguel M. Rojo, Tony F. Heinz, Eric Pop
Understanding growth, grain boundaries (GBs), and defects of emerging two-dimensional (2D) materials is key to enabling their future applications. For quick, non-destructive metrology, many studies rely on confocal Raman spectroscopy, whose spatial

Nanowire Aptasensors for Electrochemical Detection of Cell-Secreted Cytokines

October 9, 2017
Author(s)
Ying Liu, Ali Rahimian, Sergiy Krylyuk, Tam Vu, Bruno Crulhas, Gulnaz Stybayeva, Dong-Sik Shin, Albert Davydov, Alexander Revzin, Meruyert Imanbekova
Cytokines are small proteins secreted by immune cells in response to pathogens/infections; therefore these proteins can be used in diagnosing infectious diseases. For example, release of a cytokine interferon (IFN)-γ from T-cells is used for blood-based

The structural phases and vibrational properties of Mo1-xWxTe2 alloys

September 1, 2017
Author(s)
Sean M. Oliver, Ryan Beams, Sergiy Krylyuk, Arunima Singh, Irina Kalish, Alina Bruma, Francesca Tavazza, Iris Stone, Stephan J. Stranick, Albert Davydov, Patrick M. Vora
The structural polymorphism in transition metal dichalcogenides (TMDs) provides exciting opportunities for developing advanced electronics. For example, MoTe2 crystallizes in the 2H semiconducting phase at ambient temperature and pressure, but transitions

Novel Nanofluidic Chemical Cells based on Self-Assembled Solid-State SiO2 Nanotubes

August 30, 2017
Author(s)
Hao Zhu, Haitao Li, Arvind Balijepalli, Joseph W. Robertson, Sergiy Krylyuk, Albert Davydov, John J. Kasianowicz, John S. Suehle, Qiliang Li
Novel nanofluidic chemical cells based on self-assembled solid-state SiO2 nanotubes on silicon- on-insulator (SOI) substrates have been successfully fabricated and tested. The vertical SiO2 nanotubes with a smooth cavity are built from Si nanowires which

Fabrication and Characterization of Humidity Sensors based on CVD Grown MoS2 Thin Film

July 25, 2017
Author(s)
Shiqi Guo, Abbas Arab, Sergiy Krylyuk, Albert Davydov, Mona E. Zaghloul
Recent advances in two-dimensional (2D) transition metal dichalcogenides have demonstrated their potential application in chemical sensors. However, the chemical vapor deposition (CVD) grown molybdenum disulfide (MoS2) humidity sensors are still largely

Rapid determination of nanowire electrical properties using a dielectrophoresis-well based system

March 28, 2017
Author(s)
Sergiy Krylyuk, Albert Davydov, Marios Constantinou, Kai F. Hoettges, Grigorios P. Rigas, Vlad Stolojan, Maxim Shkunov
The use of high quality semiconducting nanomaterials for advanced device applications has been hampered by the unavoidable variability in the growth of one-dimensional (1D) nanomaterials such as nanowires (NWs) and nanotubes, resulting in highly variable

Identification of the Crystal Symmetry in 1T' MoTe2 with Polarization-Resolved Second Harmonic Generation and Raman Scattering

October 13, 2016
Author(s)
Ryan Beams, Luiz Gustavo Cancado, Sergiy Krylyuk, Irina Kalish, Berc Kalanyan, Arunima Singh, Kamal Choudhary, Patrick Vora, Francesca M. Tavazza, Albert Davydov, Stephan J. Stranick
We study the crystal symmetry properties of few-layer 1T' MoTe2 using the polarization dependence of the second harmonic generation (SHG) and Raman scattering. Bulk 1T' MoTe2 is know to be inversion symmetric, however, we nd that the inversion symmetry is

Phonon Anharmonicity in Bulk Td-MoTe2

July 18, 2016
Author(s)
Albert Davydov, Sergiy Krylyuk, Irina Kalish, Ryan Beams, Patrick Vora
We examine anharmonic contributions to the optical phonon frequency in bulk Td-MoTe2 phase through temperature-dependent Raman spectroscopy. At temperatures greater than 100 K we find that the optical phonon modes redshift linearly with temperature in

Near-theoretical fracture strengths in native and oxidized silicon nanowires

June 21, 2016
Author(s)
Frank W. DelRio, Ryan M. White, Sergiy Krylyuk, Albert Davydov, Lawrence H. Friedman, Robert F. Cook
In this letter, fracture strengths σf of native and oxidized silicon nanowires (SiNWs) were determined via atomic force microscopy bending experiments and nonlinear finite element analysis. In the native SiNWs, σf in the Si was comparable to the

Near-field microwave microscopy of one-dimensional nanostructures

May 23, 2016
Author(s)
Samuel Berweger, Paul T. Blanchard, Rebecca C. Quardokus, Frank W. DelRio, Thomas Mitchell (Mitch) Wallis, Pavel Kabos, Sergiy Krylyuk, Albert Davydov
With the ability to measure sample conductivity with nanometer spatial resolution, scanning microwave microscopy (SMM) is a powerful tool to study nanoscale electronic systems and devices. Here we demonstrate the general capability to image electronic

Structural and optical nanoscale analysis of GaN core-shell microrod arrays fabricated by combined top-down and bottom-up process on Si (111)

May 15, 2016
Author(s)
Sergiy Krylyuk, Marcus Muller, Gordon Schmidt, Sebastian Metzner, Peter Veit, Frank Bertram, Ratan K. Debnath, Jong Yoon Ha, Baomei Wen, Paul T. Blanchard, Alexana Roshko, Abhishek Motayed, Matthew R. King, Albert Davydov, Jurgen Christen
Large arrays of GaN core-shell microrods were fabricated on Si(111) substrates applying a combined bottom-up and top-down approach which includes inductively coupled plasma (ICP) etching of patterned GaN films grown by metal-organic vapor phase epitaxy

Faceting Control in Core/Shell GaN micropillars using Selective Epitaxy

October 15, 2014
Author(s)
Sergiy Krylyuk, Heayoung Yoon, Baomei Wen, Abhishek Motayed, Albert Davydov, Matt N. King
We report on fabricating large-area, vertically aligned GaN epitaxial core-shell micropillar arrays. The two-step process consisted of inductively coupled plasma (ICP) etch of lithographically patterned n-type GaN substrate followed by selective growth of

Miniature all-solid-state heterostructure nanowire Li-ion batteries as a tool for engineering and structural diagnostics of nanoscale electrochemical processes.

August 15, 2014
Author(s)
Vladimir P. Oleshko, Thomas F. Lam, Dmitry A. Ruzmetov, Paul M. Haney, Henri J. Lezec, Albert Davydov, Sergiy Krylyuk, John Cumings, Albert A. Talin
Complex interfacial phenomena and phase transformations that govern the operation of Li-ion batteries (LiBs) require detailed nanoscale 3D structural and compositional characterization that can be directly related to the capacity and electrical transport

Analytical Electron Microscopy of Semiconductor Nanowire Functional Materials and Devices for Emerging Applications.

October 2, 2013
Author(s)
Vladimir P. Oleshko, Elissa H. Williams, Albert Davydov, Sergiy Krylyuk, Abhishek Motayed, Dmitry A. Ruzmetov, Thomas F. Lam, Henri J. Lezec, Albert A. Talin
Functionalized individual semiconductor nanowires (SNWs) and 3D SNW arrays attract a continuously growing interest for applications in optoelectronics, sensing, and energy storage. High-resolution field-emission analytical (S)TEM enables critical insights

Selective Streptavidin Bioconjugation on Si and SiC nanowires for Biosensor Applications.

January 14, 2013
Author(s)
Elissa H. Williams, John A. Schreifels, Mulpuri V. Rao, Albert Davydov, Vladimir P. Oleshko, Nancy J. Lin, Kristen L. Steffens, Sergiy Krylyuk, Kristine A. Bertness, Amy Manocchi, Yaroslav Koshka
A functionalization method for the specific and selective immobilization of the streptavidin (SA) protein on semiconductor nanowires (NWs) was developed. Silicon (Si) and silicon carbide (SiC) NWs were functionalized with 3-aminopropyltriethoxysilane

Selective Streptavidin Bioconjugation on Si, SiC, and GaN Nanowires for Biosensor Applications.

October 19, 2012
Author(s)
Elissa H. Williams, John A. Schreifels, Mulpuri V. Rao, Albert Davydov, Vladimir Oleshko, Nancy Lin, Kristen L. Steffens, Sergiy Krylyuk, Kristine A. Bertness, Amy Manocchi, Yaroslav Koshka
A functionalization method for the specific and selective immobilization of the streptavidin (SA) protein on semiconductor nanowires (NWs) was developed. Silicon (Si), silicon carbide (SiC), and gallium nitride (GaN) NWs were functionalized with 3

In Situ Atomic Scale Imaging of Electrochemical Lithiation of Silicon

October 7, 2012
Author(s)
Xiao Hua Liu, Sergiy Krylyuk, Albert Davydov, Jian Yu Huang
In lithium-ion batteries, the electrochemical reaction between the electrodes and lithium is a critical process that controls the capacity, cyclability and reliability of the battery. Despite intensive study, the atomistic mechanism of the electrochemical
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