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Random Networks and Aligned Arrays of Single-Walled Carbon Nanotubes for Electronic Device Applications

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Nano Research 2008年第4期1卷 259-272页

作者： Qing Cao john a.rogers Department of Chemistry University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Materials Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Mechanical Science and Engineering University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Frederick-Seitz Materials Research Laboratory University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Beckman Institute for Advanced Science and Technology University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA

Singled-walled carbon nanotubes(SWNTs),in the form of ultrathin fi lms of random networks,aligned arrays,or anything in between,provide an unusual type of electronic material that can be integrated into circuits in a conventional,scalable *** electrical,mechanical,and optical properties of such fi lms can,in certain cases,approach the remarkable characteristics of the individual SWNTs,thereby making them attractive for applications in electronics,sensors,and other *** review discusses the synthesis and assembly of SWNTs into thin film architectures of various types and provides examples of their use in digital electronic circuits with levels of integration approaching 100 transistors and in analog radio frequency(RF)systems with operating frequencies up to several gigahertz,including transistor radios in which SWNT transistors provide all of the active *** results represent important steps in the development of an SWNT-based electronics technology that could fi nd utility in areas such as fl exible electronics,RF analog devices and others that might complement the capabilities of established systems.

关键词： Carbon nanotubes electronic devices thin-film transistors

Analytical Modeling of Flowrate and Its Maxima in Electrochemical Bioelectronics with Drug Delivery Capabilities

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Research 2022年第3期2022卷 61-73页

作者： Raudel Avila Yixin Wu Rinaldo Garziera john a.rogers Yonggang Huang Department of Mechanical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Materials Science and Engineering Northwestern UniversityEvanstonIL 60208USA Querrey Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL 60208USA Dipartimento di Ingegneria ed Architettura Universitàdi ParmaItaly Department of Biomedical Engineering Northwestern UniversityEvanstonIL 60208USA Department of Electrical and Computer Engineering Northwestern UniversityEvanstonIL 60208USA Department of Chemistry Northwestern UniversityEvanstonIL 60208USA Department of Neurological Surgery Northwestern UniversityFeinberg School of MedicineChicagoIL 60611USA Department of Civil and Environmental Engineering Northwestern UniversityEvanstonIL 60208USA

Flowrate control in flexible bioelectronics with targeted drug delivery capabilities is essential to ensure timely and safe *** neuroscience and pharmacogenetics studies in small animals,these flexible bioelectronic systems can be tailored to deliver small drug volumes on a controlled fashion without damaging surrounding tissues from stresses induced by excessively high *** drug delivery process is realized by an electrochemical reaction that pressurizes the internal bioelectronic chambers to deform a flexible polymer membrane that pumps the drug through a network of microchannels implanted in the small *** flowrate temporal profile and global maximum are governed and can be modeled by the ideal gas ***,we obtain an analytical solution that groups the relevant mechanical,fluidic,environmental,and electrochemical terms involved in the drug delivery process into a set of three nondimensional *** unique combinations of these three nondimensional parameters(related to the initial pressure,initial gas volume,and microfluidic resistance)can be used to model the flowrate and scale up the flexible bioelectronic design for experiments in medium and large animal *** analytical solution is divided into(1)a fast variable that controls the maximum flowrate and(2)a slow variable that models the temporal ***,the two variables detail the complete drug delivery process and control using the three nondimensional *** of the analytical model with alternative numerical models shows excellent agreement and validates the analytic modeling *** findings serve as a theoretical framework to design and optimize future flexible bioelectronic systems used in biomedical research,or related medical fields,and analytically control the flowrate and its global maximum for successful drug delivery.

关键词： governed Electrochemical Flow

Challenges and opportunities in flexible,stretchable and morphable bio-interfaced technologies

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National Science Review 2022年第10期9卷 10-13页

作者： Abraham Vázquez-Guardado Yiyuan Yang john a.rogers Center for Bio-Integrated Electronics Northwestern University Querrey Simpson Institute for Bioelectronics Northwestern University Department of Mechanical Engineering Northwestern University Department of Materials Science and Engineering Northwestern University Department of Biomedical Engineering Northwestern University Department of Neurological Surgery Feinberg School of Medicine Northwestern University

Living organisms operate on the basis of dynamic biochemical processes elicited by a rich diversity of endogenous and exogenous *** higher-level forms of life,the result manifests as complex patterns of behavior and ultimately in the form of intelligence and *** classes of biocompatible electronic interfaces support expanding possibilities in bidirectional communication.

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Theory and Practice of“Striping”for Improved ON/OFF Ratio in Carbon Nanonet Thin Film Transistors

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Nano Research 2009年第2期2卷 167-175页

作者： Ninad Pimparkar Qing Cao john a.rogers Muhammad A.Alam School of Electrical and Computer Engineering Purdue UniversityWest LafayetteIndiana 47907-1285USA Department of Chemistry Materials and Science Engineering Electrical and Computer Engineering Beckman Institute Frederick and Seitz Materials Res.Lab University of IllinoisUrbanaIL 61801USA

A new technique to reduce the influence of metallic carbon nanotubes(CNTs)relevant for large-scale integrated circuits based on CNT-nanonet transistorsis proposed and ***,electrical and chemical filtering of the metallic CNTs have been used to improve the ON/OFF ratio of CNT-nanonet transistors;however,the corresponding degradation in ON-current has made these techniques somewhat ***,we abandon the classical approaches in favor of a new approach based on relocation of asymmetric percolation threshold of CNT-nanonet transistors by a technique called“striping”;this allows fabrication of transistors with ON/OFF ratio>1000 and ON-current degradation no more than a factor of *** offer first principle numerical models,experimental confirmation,and renormalization arguments to provide a broad theoretical and experimental foundation of the proposed method.

关键词： Nanonet Carbon nanotube flexible electronics thin film transistors

Recent advances in microsystem approaches for mechanical characterization of soft biological tissues

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Microsystems & Nanoengineering 2022年第4期8卷 1-16页

作者： Enming Song Ya Huang Ningge Huang Yongfeng Mei Xinge Yu john a.rogers Shanghai Frontiers Science Research Base of Intelligent Optoelectronics and Perception Institute of OptoelectronicsFudan UniversityShanghai 200433China International Institute of Intelligent Nanorobots and Nanosystems Fudan UniversityShanghai 200433China Department of Biomedical Engineering City University of Hong KongHong Kong 999077China Department of Materials Science Fudan UniversityShanghai 200433China Querrey Simpson Institute for Bioelectronics Department of Materials Science and EngineeringDepartments of Biomedical EngineeringNeurological SurgeryChemistryMechanical EngineeringElectrical Engineering and Computer ScienceNorthwestern UniversityEvanstonIL 60208USA

Microsystem technologies for evaluating the mechanical properties of soft biological tissues offer various capabilities relevant to medical research and clinical diagnosis of pathophysiologic *** progress includes(1)the development of tissue-compliant designs that provide minimally invasive interfaces to soft,dynamic biological surfaces and(2)improvements in options for assessments of elastic moduli at spatial scales from cellular resolution to macroscopic areas and across depths from superficial levels to deep *** review summarizes a collection of these technologies,with an emphasis on operational principles,fabrication methods,device designs,integration schemes,and measurement *** core content begins with a discussion of platforms ranging from penetrating filamentary probes and shape-conformal sheets to stretchable arrays of ultrasonic *** sections examine different techniques based on planar microelectromechanical system(MEMS)approaches for biocompatible interfaces to targets that span scales from individual cells to *** highlighted example includes miniature electromechanical devices that allow depth profiling of soft tissue biomechanics across a wide range of *** clinical utility of these technologies is in monitoring changes in tissue properties and in targeting/identifying diseased tissues with distinct variations in *** results suggest future opportunities in engineered systems for biomechanical sensing,spanning a broad scope of applications with relevance to many aspects of health care and biology research.

关键词： advances identifying utility

Inorganic semiconducting materials for flexible and stretchable electronics

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npj Flexible Electronics 2017年第1期1卷 16-29页

作者： Ki Jun Yu Zheng Yan Mengdi Han john a.rogers School of Electrical and Electronic Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Chemical Engineering and Department of Mechanical&Aerospace Engineering University of MissouriColumbiaMissouri 65211USA Center for Bio-Integrated Electronics Northwestern UniversityEvanstonIllinois 60208USA Departments of Materials Science and Engineering Biomedical EngineeringChemistryMechanical EngineeringElectrical Engineering and Computer Scienceand Neurological Surgery Simpson Querrey Institute for Nano/biotechnologyMcCormick School of Engineering and Feinberg School of MedicineNorthwestern UniversityEvanstonIL 60208USA

Recent progress in the synthesis and deterministic assembly of advanced classes of single crystalline inorganic semiconductor nanomaterial establishes a foundation for high-performance electronics on bendable,and even elastomeric,*** results allow for classes of systems with capabilities that cannot be reproduced using conventional wafer-based ***,electronic devices that rely on the unusual shapes/forms/constructs of such semiconductors can offer mechanical properties,such as flexibility and stretchability,traditionally believed to be accessible only via comparatively low-performance organic materials,with superior operational features due to their excellent charge transport ***,these approaches allow integration of high-performance electronic functionality onto various curvilinear shapes,with linear elastic mechanical responses to large strain deformations,of particular relevance in bio-integrated devices and bio-inspired *** review summarizes some recent progress in flexible electronics based on inorganic semiconductor nanomaterials,the key associated design strategies and examples of device components and modules with utility in biomedicine.

关键词： inorganic electronic traditionally

Functional Hydrogel Interface Materials for Advanced Bioelectronic Devices

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Accounts of Materials Research 2021年第11期2卷 1010-1023页

作者： Quansan Yang Ziying Hu john a.rogers Querrey Simpson Institute for Biotechnology Northwestern UniversityEvanstonIllinois 60208United States Department of Mechanical Engineering Northwestern UniversityEvanstonIllinois 60208United States Department of Mechanical Engineering Department of Materials Science and Engineeringand Department of Biomedical EngineeringNorthwestern UniversityEvanstonIllinois 60208United States Department of Neurological Surgery Feinberg School of MedicineNorthwestern UniversityChicagoIllinois 60611United States

CONSPECTUS:A frontier area of modern research focuses on emerging classes of implantable bioelectronic devices with unique modes of operation that are relevant both to research studies and to medical *** advanced technologies have the potential to enable revolutionary diagnostic and therapeutic capabilities relevant to a wide spectrum of disorders,where seamless integration onto the surfaces of vital organs allows for accurate sensing,stimulation,or even concurrent sensing and *** for tissue-like interfaces,such as hydrogels,that enable soft mechanical coupling and multifunctional,bidirectional exchange between these technology platforms and living systems are critically *** hydrogels offer significant promise in this context,as illustrated in recent demonstrations of interlayers that support optical,mechanical,electrical,optical,thermal,and biochemical modes of interaction,with chronic biocompatibility and stable function in live animal *** Account highlights recent progress in hydrogel materials that serve as interfaces between bioelectronics systems and soft tissues to facilitate implantation and to support sensing and *** content includes materials concepts,compositions,chemistries,and structures that allow for bioelectronic *** as interfacial adhesives and as surface coatings to support mechanical,electrical,optical,thermal,and/or chemical coupling highlight the broad range of *** Account begins with hydrogels that exploit advanced chemistries to control internal hemorrhage,prevent bacterial infections,and to suppress foreign body *** sections summarize strategies to exploit the mechanics of hydrogels,such as their mechanical,tunable modulus,lubricating surfaces,and interface adhesion properties,to facilitate interactions between bioelectronic and biological *** of functional characteristics begin with the electrical conductivity of different t

关键词： electronic enable implantation

Contact radius of stamps in reversible adhesion

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Theoretical & Applied Mechanics Letters 2011年第1期1卷 7-9页

作者： Seok Kim Andrew Carlson Keh-Chih Hwang john a.rogers Department of Materials Science and Engineering Beckman Instituteand Seitz Materials Research LaboratoryUniversity of Illinois at Urbana-ChampaignUrbanaIllinois 61801 Department of Engineering Mechanics Tsinghua University

A mechanics model is developed for the contact radius of stamps with pyramid tips in transfer *** is important to the realization of reversible control of adhesion,which has many important applications,such as climbing robots,medical tapes,and transfer printing of *** contact radius is shown to scale linearly with the work of adhesion between the stamp and the contacting surface,and inversely with the plane-strain modulus of the stamp. It also depends on the cone angle and tip radius of the stamp,but is essentially independent of details of the tip geometry.

关键词： contact mechanics reversible adhesion contact radius

Theoretical and Experimental Studies of Schottky Diodes that Use Aligned Arrays of Single-Walled Carbon Nanotubes

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Nano Research 2010年第6期3卷 444-451页

作者： Xinning Ho Lina Ye Slava V.Rotkin Xu Xie Frank Du Simon Dunham Jana Zaumseil john a.rogers Department of Materials Science and Engineering Beckman Instituteand Frederick Seitz Materials Research LaboratoryUniversity of Illinois at Urbana-Champaign1304 West Green StreetUrbanaIllinois 61801USA Department of Chemistry University of Science and Technology of ChinaHefei 230026China Department of Physics Lehigh UniversityBethlehemPennsylvania 18015 and Centre for Advanced Materials and NanotechnologyLehigh UniversityBethlehemPennsylvania 18015USA Center for Nanoscale Materials Argonne National LaboratoryArgonneIllinois 60439USA Department of Chemistry University of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA Department of Electrical and Computer Engineering Mechanical Science and EngineeringUniversity of Illinois at Urbana-ChampaignUrbanaIllinois 61801USA

We present theoretical and experimental studies of Schottky diodes that use aligned arrays of single-walled carbon nanotubes. A simple physical model, taking into account the basic physics of current rectification, can adequately describe the single-tube and array devices. We show that for as-grown array diodes, the rectification ratio, defined by the maximum-to-minimum-current-ratio, is low due to the presence of metallic-single-walled nanotube (SWNT) shunts. These tubes can be eliminated in a single voltage sweep resulting in a high rectification array device. Further analysis also shows that the channel resistance, and not the intrinsic nanotube diode properties, limits the rectification in devices with channel length up to 10 μm.

关键词： Schottky diodes aligned arrays single-walled carbon nanotubes