Article
Chemistry, Physical
Wenwen Liu, Zhengyong Song
Summary: A dual-tunable metamaterial absorption modulator has been proposed based on a hybrid vanadium dioxide-graphene configuration, allowing for dynamic adjustments of absorption intensity and frequency through external stimuli. The design consists of narrowband and broadband absorbers, which are polarization-insensitive for small incident angles.
Article
Materials Science, Multidisciplinary
Jiran Liang, Lize Yu, Yunxia Wang, Tao Xue, Dangyuan Lei, Zhaoyang Wang, Xinzhe Li
Summary: In this study, periodic arrays of 3D composite structures consisting of gold nanoparticle capped VO2 shells on self-assembled highly-ordered SiO2 microspheres were designed and fabricated. The temperature-tunable surface-enhanced Raman scattering (SERS) performance of these structures was investigated. The results showed that the SERS intensity enhancement factor increased when triggering the semiconductor-to-metal phase transition of VO2 by temperature rise, which strengthened the plasmonic coupling between the AuNPs and VO2 shells. This periodic array with tunable plasmonic coupling has great potential for various optical applications.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Optics
Jonathan King, Chenghao Wan, Tae Joon Park, Sanket Deshpande, Zhen Zhang, Shriram Ramanathan, Mikhail A. Kats
Summary: We demonstrate an electrically controlled VO2-metal metasurface that functions as a tunable optical switch, optical limiter with tunable threshold, and nonlinear optical isolator. The device achieves tunability through Joule heating and shows promising applications.
Article
Physics, Applied
Jie-Long Fang, Lei Qu, Hong-Liang Yi
Summary: This study theoretically demonstrates the near-field radiative thermal switching between nanoparticles and proposes a multilayered structure composed of SiC and VO2. The multilayered structure, combined with the phase transition feature of VO2, enables the active modulation of surface polaritons and efficient control of heat flux between nanoparticles.
PHYSICAL REVIEW APPLIED
(2022)
Article
Materials Science, Multidisciplinary
Ruinan Li, Liu Wang, Yapeng Tian, Yunfeng Chao, Xinwei Cui, Qun Xu
Summary: A novel graphene oxide (GO)-assisted strategy is proposed for the synthesis of mesoporous VO2/G nanobelts with abundant oxygen defects, enabling high-performance Zn2+ storage. Oxygen vacancies and mesopores facilitate the insertion/extraction process of Zn2+. After in-situ electrochemical activation, monoclinic VO2 transforms into layered V2O5•nH(2)O, delivering an extremely high reversible capacity of 731 mAh/g (0.1 A/g). Additionally, superior high-rate and cycling performances are achieved.
Article
Chemistry, Physical
Adrian Ionut Bercea, Corinne Champeaux, Alexandre Boulle, Catalin Daniel Constantinescu, Julie Cornette, Maggy Colas, Sylvain Vedraine, Frederic Dumas-Bouchiat
Summary: LSPR modulation is achieved through the synthesis and shape modifications of nanoplatelet arrays. The combination of the nanoplatelet arrays with a thermochromic material leads to a smart nanocomposite with modulated absorptions. Experimental and modeling investigations demonstrate that the modulation originates from the formation of a core-shell structure.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Jianhua Yang, Jiapeng Zheng, Ruoqi Ai, Yunhe Lai, Tsz Him Chow, Lei Shao, Jianfang Wang
Summary: Light-driven nanomotors have potential applications but face challenges in moving at solid-liquid interfaces. By utilizing the plasmon resonance of gold nanocrystals, nanomotors moving at the silicon-aqueous solution interface have been developed, offering a self-traced system and a method for nanoscale silicon pattern fabrication.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Yao Lu, Shiu Hei Lam, Wenzheng Lu, Lei Shao, Tsz Him Chow, Jianfang Wang
Summary: In this study, all-state switching of differently sized PANI nanospheres (NSs) and active plasmon switching on PANI-coated Au nanodisks (NDs) were achieved by proton doping/dedoping and electrochemical methods. The study provides a fundamental understanding of the optical properties of PANI and opens up possibilities for developing high-performance dynamic media for active plasmonics.
Article
Nanoscience & Nanotechnology
Syed A. Bukhari, Ryan McGee, Amirhossein Mahdavi, Farid Bensebaa, Liang Zhou, Hyun-Joong Chung, Thomas Thundat, Ankur Goswami
Summary: Vanadium dioxide (VO2) exhibits an insulator to metal transition at 68 degrees C, displaying significant changes in multiple physical properties. By precise strain engineering, the transition temperature can be reduced. A noncontact, all-optical platform is demonstrated to study macroscopic dynamics related to localized structural rearrangements. Multiple stable frequencies of the resonator can be activated at different optical powers and wavelengths, showing potential applications in ultrafast optical switching and intelligent temperature sensors.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Anton Plech, Anna R. Ziefuss, Matteo Levantino, Rene Streubel, Stefan Reich, Sven Reichenberger
Summary: This paper investigates the effects and mechanisms of laser excitation on gold nanoparticles and finds that the energy uptake efficiency of gold nanoparticles is significantly reduced at on-resonant excitation with 532nm compared to interband excitation with 400nm. The lower heating efficiency is related to ultrafast plasmon bleaching and its recovery, as well as a significant residual dissipation channel in the case of on-resonant excitation.
Article
Chemistry, Physical
Alejandra Romero-Moran, Jose L. Sanchez-Salas, Joel Molina-Reyes
Summary: The study established the influence of the crystalline phase and agglomeration degree of TiO2 nanoparticles on photocatalytic hydroxyl radical formation and bacterial inactivation in TiO2/SiO2 composite coatings. A relationship between hydroxyl radicals' formation and charge carrier transfer mechanism between defect levels in SiO2 and TiO2 embedded nanoparticles was established through a simple spectroscopic method. This correlation complements the lack of mechanisms behind the photocatalytic activity in TiO2/SiO2 composites.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Haomin Guan, Zheng Tian, Qinghong Kong, Guangcheng Xi
Summary: By synthesizing rough VO2(D) nanostars and nanospheres with highly dense and rough surfaces, highly sensitive Raman spectrum substrates can be prepared with a detection limit as low as 10^(-9) M for Rhodamine 6G.
CHEMICAL COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Zhengjing Zhao, Donglai Li, Jingbo Li, Haibo Jin
Summary: In this study, a method for obtaining self-assembled nanostructured VO2 film is proposed, which is achieved by controlling the precursor component and thermal annealing. The unique nanostructure of the VO2 film enhances its optical properties effectively. The resulting nanostructured VO2 film demonstrates excellent comprehensive thermochromic performance, with a solar modulation value of -14.0% and a visible transmittance value of -56.0%, making it highly promising for smart window applications.
Article
Nanoscience & Nanotechnology
Zhongshao Li, Cuicui Cao, Ming Li, Lulu Wang, Dandan Zhu, Fang Xu, Aibin Huang, Ping Jin, Lili Yu, Xun Cao
Summary: In this study, gradient variation oxygen-content vanadium-oxygen composite films (V2O3/VO2/V2O5, VOgv) with enhanced crystallinity and excellent durability were prepared by one-step continuous sputtering. Optical measurements showed that the VOgv films had significantly increased solar modulation (ΔTsol) by 145% (from 6.85% to 16.80%) and reduced hysteresis loop width by 67% (from 19.34°C to 6.36°C) compared to VO2 films, while exhibiting a wider preparation window. Accelerated tests demonstrated an equivalent service life of approximately 20 years for the VOgv films. By simplifying the preparation process through the intrinsic similarity in properties of vanadium oxide compounds, we have overcome existing application bottlenecks and increased the commercialization possibility of VO2-based thermochromic smart windows.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Aleksandra S. Falchevskaya, Nikita K. Kulachenkov, Semyon Bachinin, Valentin A. Milichko, Vladimir V. Vinogradov
Summary: Active control of metallic particles' optical properties for nonlinear nanophotonics and compact optoelectronic devices is promising. Reversible/irreversible shape modulation of liquid metal microparticles allows for dynamic tuning of color and brightness, with composition and morphology affecting the tuning effects.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Engineering, Manufacturing
Joyeeta Nag, Shishir Ray, Kriteshwar K. Kohli, Andrew H. Simon, Brian A. Cohen, Felipe Tijiwa-Birk, Christopher J. Parks, Siddarth A. Krishnan
IEEE TRANSACTIONS ON SEMICONDUCTOR MANUFACTURING
(2015)
Article
Physics, Condensed Matter
Nathaniel F. Brady, Kannatassen Appavoo, Minah Seo, Joyeeta Nag, Rohit P. Prasankumar, Richard F. Haglund, David J. Hilton
JOURNAL OF PHYSICS-CONDENSED MATTER
(2016)
Article
Nanoscience & Nanotechnology
Filip Ligmajer, Lukas Kejik, Uddhab Tiwari, Meng Qiu, Joyeeta Nag, Martin Konecny, Tomas Sikola, Wei Jin, Richard F. Haglund, Kannatassen Appavoo, Dang Yuan Lei
Article
Chemistry, Multidisciplinary
Kannatassen Appavoo, Bin Wang, Nathaniel F. Brady, Minah Seo, Joyeeta Nag, Rohit P. Prasankumar, David J. Hilton, Sokrates T. Pantelides, Richard F. Haglund
Article
Physics, Applied
K. Aryana, J. T. Gaskins, J. Nag, J. C. Read, D. H. Olson, M. K. Grobis, P. E. Hopkins
APPLIED PHYSICS LETTERS
(2020)
Article
Multidisciplinary Sciences
Kiumars Aryana, John T. Gaskins, Joyeeta Nag, Derek A. Stewart, Zhaoqiang Bai, Saikat Mukhopadhyay, John C. Read, David H. Olson, Eric R. Hoglund, James M. Howe, Ashutosh Giri, Michael K. Grobis, Patrick E. Hopkins
Summary: Phase change memory (PCM) is a rapidly growing technology that offers advancements in storage-class memories and enables in-memory data processing. By manipulating the interfacial thermal resistance between the phase change unit and the electrodes, reductions in effective thermal conductivity and reset current can be achieved, leading to opportunities for power reduction in PCMs.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Kiumars Aryana, Derek A. Stewart, John T. Gaskins, Joyeeta Nag, John C. Read, David H. Olson, Michael K. Grobis, Patrick E. Hopkins
Summary: By systematically tailoring the cross-linking network among the atoms, the authors successfully suppressed the thermal transport in amorphous chalcogenide alloy SiTe, reducing the thermal conductivity by nearly an order of magnitude. The experimental results demonstrate that the ultralow thermal conductivity is attributed to the suppressed contribution of extended modes of vibration, particularly propagons and diffusons. This mechanism could potentially lead to significant advancements in thermal management for data storage and energy scavenging applications.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Kiumars Aryana, Yifei Zhang, John A. Tomko, Md Shafkat Bin Hoque, Eric R. Hoglund, David H. Olson, Joyeeta Nag, John C. Read, Carlos Rios, Juejun Hu, Patrick E. Hopkins
Summary: Integrated nanophotonics is an emerging research direction that has attracted great interests. By substituting tellurium with selenium in Ge2Sb2Se4Te, the thermal conductivity transitions from an electron to a phonon dominated regime.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Kiumars Aryana, John A. Tomko, Ran Gao, Eric R. Hoglund, Takanori Mimura, Sara Makarem, Alejandro Salanova, Md Shafkat Bin Hoque, Thomas W. Pfeifer, David H. Olson, Jeffrey L. Braun, Joyeeta Nag, John C. Read, James M. Howe, Elizabeth J. Opila, Lane W. Martin, Jon F. Ihlefeld, Patrick E. Hopkins
Summary: Materials with tunable thermal properties are crucial for the development of solid-state refrigeration, energy scavenging, and thermal circuits. This study demonstrates the bidirectional switching of thermal conductivity in antiferroelectric PbZrO3 by manipulating phonon scattering rates. PbZrO3 shows potential as a fast, repeatable, simple trigger, and reliable thermal switch.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Coatings & Films
Kartik Sondhi, Rahul Sharangpani, Ramy Nashed Bassely Said, Joyeeta Nag, Michael Gribelyuk, Senaka Kanakamedala, Raghuveer S. S. Makala
Summary: The adoption of new materials driven by trends in device miniaturization has contributed to significant advancements in semiconductor technology. Thin-film deposition and lithographic techniques are crucial for achieving further scaling of devices. Area selective deposition is a powerful technique that can eliminate the need for multiple lithography steps, making the process more efficient.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Engineering, Electrical & Electronic
Roshan J. Tirukkonda, Mark D. Kraman, Rahul Sharangpani, Kartik Sondhi, Aaron N. Fancher, Stephen R. Ross, Joyeeta Nag, Alexei L. Bogdanov, Raghuveer S. Makala, Senaka K. Kanakamedala
Summary: Miniaturization and scaling of semiconductor devices require innovative techniques to sustain advancements. A promising trend is the migration from 2D to 3D device architectures, which necessitate the fabrication of high-aspect-ratio narrow features across different materials. To address the challenges of reactive ion etching, a new concept of hardmask engineering is introduced, involving a bilayer hardmask scheme consisting of a conventional hardmask encapsulated with a thin layer of etch-resistant ruthenium (Ru) layer. Experimental results show that this engineered hardmask improves etch profile and critical dimensions (CDs).
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Materials Science, Multidisciplinary
Kannatassen Appavoo, Joyeeta Nag, Bin Wang, Weidong Luo, Gerd Duscher, E. Andrew Payzant, Matthew Y. Sfeir, Sokrates T. Pantelides, Richard F. Haglund
Proceedings Paper
Engineering, Electrical & Electronic
John Safran, Giri N. K. Rangan, Venkata Nr Vanukuru, Sandeep Torgal, Vikram Chaturvedi, Sarath K. P. Lal, Shahid Butt, Gary Maier, Alberto Cestero, Thuy Tran-Quinn, Joyeeta Nag, Sami Rosenblatt, Norman Robson, Matthew Angyal, Troy Graves-Abe, Daniel Berger, James Pape, Subramanian Iyer
2016 IEEE 66TH ELECTRONIC COMPONENTS AND TECHNOLOGY CONFERENCE (ECTC)
(2016)
Proceedings Paper
Engineering, Electrical & Electronic
Kannatassen Appavoo, Bin Wang, Joyeeta Nag, Matthew Y. Sfeir, Sokrates T. Pantelides, Richard F. Haglund
2015 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
(2015)
Proceedings Paper
Engineering, Electrical & Electronic
Joyeeta Nag, Kriti Kohli, Andrew Simon, Siddarth Krishnan, Christopher Parks, Shishir Ray, Felipe Tijiwa-Birk
2014 25TH ANNUAL SEMI ADVANCED SEMICONDUCTOR MANUFACTURING CONFERENCE (ASMC)
(2014)
