A5031487602- Graphene research and applications
- Photoreceptor and optogenetics research
- Neuroscience and Neural Engineering
- RNA modifications and cancer
- Advanced Sensor and Energy Harvesting Materials
- Cancer-related gene regulation
- Epigenetics and DNA Methylation
- Carbon Nanotubes in Composites
- Pancreatic and Hepatic Oncology Research
- Photonic and Optical Devices
- Neural dynamics and brain function
- Renal and related cancers
- Cancer-related molecular mechanisms research
- Renal cell carcinoma treatment
- Advanced Fiber Optic Sensors
- Heat shock proteins research
- Graphene and Nanomaterials Applications
- 3D Printing in Biomedical Research
- Photonic Crystal and Fiber Optics
- 2D Materials and Applications
- Tactile and Sensory Interactions
- Semiconductor Lasers and Optical Devices
- Photoacoustic and Ultrasonic Imaging
- Photonic Crystals and Applications
- Quantum and electron transport phenomena
Virginia Tech
2002-2025
Qiongtai Teachers College
2025
Guangzhou Medical University
2020-2022
Beijing University of Civil Engineering and Architecture
2021-2022
Massachusetts Institute of Technology
2008-2020
McGovern Institute for Brain Research
2020
Institute for Soldier Nanotechnologies
2013-2015
Cambridge Electronics (United States)
2013
Oak Ridge National Laboratory
2009
Institute for Scientific and Technological Research
2009
In this work we present a low cost and scalable technique, via ambient pressure chemical vapor deposition (CVD) on polycrystalline Ni films, to fabricate large area ( approximately cm2) films of single- few-layer graphene transfer the nonspecific substrates. These consist regions 1 12 layers. Single- or bilayer can be up 20 mum in lateral size. The are continuous over entire patterned lithographically by prepatterning underlying film. transparency, conductivity, ambipolar characteristics...
Hexagonal boron nitride (h-BN) is very attractive for many applications, particularly, as protective coating, dielectric layer/substrate, transparent membrane, or deep ultraviolet emitter. In this work, we carried out a detailed investigation of h-BN synthesis on Cu substrate using chemical vapor deposition (CVD) with two heating zones under low pressure (LP). Previous atmospheric (AP) CVD syntheses were only able to obtain few layer without good control the number layers. contrast, LPCVD...
In this contribution we demonstrate a method of synthesizing hexagonal boron nitride (h-BN) thin film by ambient pressure chemical vapor deposition on polycrystalline Ni films. Depending the growth conditions, thickness obtained h-BN is between ∼5 and 50 nm. The grows continuously entire surface region with uniform can be up to 20 μm in lateral size which only limited single crystal grains. structure was confirmed both electron X-ray diffraction. photoelectron spectroscopy shows B/N atomic...
In this article, the role of kinetics, in particular, pressure reaction chamber chemical vapor deposition (CVD) synthesis graphene using low carbon solid solubility catalysts (Cu), on both large area thickness uniformity and defect density are presented. Although thermodynamics system remains same, based whether process is performed at atmospheric (AP), (LP) (0.1−1 Torr) or under ultrahigh vacuum (UHV) conditions, kinetics growth phenomenon different, leading to a variation resulting over...
Graphene nanoribbons can exhibit either quasi-metallic or semiconducting behavior, depending on the atomic structure of their edges. Thus, it is important to control morphology and crystallinity these edges for practical purposes. We demonstrated an efficient edge-reconstruction process, at scale, graphitic by Joule heating. During heating electron beam irradiation, carbon atoms are vaporized, subsequently sharp step-edge arrays stabilized, mostly with zigzag- armchair-edge configurations....
We report the use of chemical vapor deposition (CVD) for bulk production (grams per day) long, thin, and highly crystalline graphene ribbons (<20-30 microm in length) exhibiting widths 20-300 nm small thicknesses (2-40 layers). These layers usually exhibit perfect ABAB... stacking as graphite crystals. The structure has been carefully characterized by several techniques electronic transport gas adsorption properties have measured. With this material available to researchers, it should be...
Hexagonal boron nitride (h-BN) is a promising material as dielectric layer or substrate for two-dimensional electronic devices. In this work, we report the synthesis of large-area h-BN film using atmospheric pressure chemical vapor deposition on copper foil, followed by Cu etching and transfer to target substrate. The growth rate at constant temperature strongly affected concentration borazine precursor ambient gas condition such ratio hydrogen nitrogen. films with different thicknesses can...
We report graphene films composed mostly of one or two layers grown by controlled carbon precipitation on the surface polycrystalline Ni thin during atmospheric chemical vapor deposition(CVD). Controlling both methane concentration CVD and substrate cooling rate growth can significantly improve thickness uniformity. As a result, one- two- layer regions occupy up to 87% film area. Single coverage accounts for 5-11% overall film. These expand across multiple grain boundaries underlying The...
Electronic devices are evolving from rigid into flexible and stretchable structures, enabling a seamless integration of electronics our everyday lives. The variety electronic materials within thermal-drawn fibers has emerged as versatile platform for the fabrication advanced functional fiber electronics. This approach exploits thermal drawing macroscopic preform, where or prefabricated arranged at prescribed position, yielding kilometers with sophisticated architecture complex...
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionNEXTORIGINAL ARTICLEThis notice is a correctionLayer Area, Few-Layer Graphene Films on Arbitrary Substrates by Chemical Vapor DepositionAlfonso Reina, Xiaoting Jia, John Ho, Daniel Nezich, Hyungbin Son, Vladimir Bulovic, Mildred S. Dresselhaus, and Jing Kong*Cite this: Nano Lett. 2009, 9, 8, 3087Publication Date (Web):July 7, 2009Publication History Published online7 July 2009Published inissue 12 August...
Abstract Understanding the cytoarchitecture and wiring of brain requires improved methods to record stimulate large groups neurons with cellular specificity. This miniaturized neural interfaces that integrate into tissue without altering its properties. Existing interface technologies have been shown provide high-resolution electrophysiological recording high signal-to-noise ratio. However, single implantation, physical properties these devices limit their access one, small region. To...
We used scanning tunneling microscopy and spectroscopy (STM/S) techniques to analyze the relationships between edge shapes electronic structures in as-grown chemical vapor deposition (CVD) graphene nanoribbons (GNRs). A rich variety of single-layered exhibiting a width several 100 nm up 1 μm long were studied. High-resolution STM images highlight highly crystalline nanoribbon with well-defined clean edges. Theoretical calculations indicate clear spin-split states induced by electron-electron...
Microelectrodes provide a direct pathway to investigate brain activities electrically from the external world, which has advanced our fundamental understanding of functions and been utilized for rehabilitative applications as brain-machine interfaces. However, minimizing tissue response prolonging functional durations these devices remain challenging. Therefore, development next-generation microelectrodes neural interfaces is actively progressing traditional inorganic materials toward...
Abstract Due to the limited regenerative ability of neural tissue, a diverse set biochemical and biophysical cues for increasing nerve growth has been investigated, including neurotrophic factors, topography electrical stimulation. In this report, we explore optogenetic control neurite as cell-specific alternative By investigating broad range optical stimulation parameters on dorsal root ganglia (DRGs) expressing channelrhodopsin 2 (ChR2), identified conditions that enhance outgrowth by...
Traditional fibre-optic drawing involves a thermally mediated geometric scaling where both the fibre materials and their relative positions are identical to those found in preform. To date, all drawn fibres limited preform composition geometry. Here, we fabricate metre-long crystalline silicon-core, silica-cladded from that does not contain any elemental silicon. An aluminium rod is inserted into macroscopic silica tube then drawn. The atoms initially core reduce silica, produce silicon...
Abstract With the recent development of wearable electronics and smart textiles, flexible sensor technology is gaining increasing attention. Compared to film‐based sensors, multimaterial fiber‐based offers unique advantages due breathability, durability, wear resistance, stretchability in fabric structures. Despite significant progress made fabrication application none existing fiber technologies allow for fully distributed pressure or temperature sensing. Herein, design thermally drawn...
Abstract Immune checkpoint blockade antibodies have promising clinical applications but suffer from disadvantages such as severe toxicities and moderate patient–response rates. None of the current delivery strategies, including local administration aiming to avoid systemic toxicities, can sustainably supply drugs over course weeks; adjustment drug dose, either lower or augment therapeutic response, is not possible. Herein, we develop an implantable miniaturized device using...
Abstract Highly stretchable fiber sensors have attracted significant interest recently due to their applications in wearable electronics, human–machine interfaces, and biomedical implantable devices. Here, a scalable approach for fabricating multifunctional electrical optical using thermal drawing process is reported. The can sustain at least 580% strain up 750% with helix structure. sensor simultaneously exhibits ultrahigh stretchability (400%), high gauge factors (≈1960), excellent...