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Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
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Integrating two fundamental energy storage elements in electrical circuits results in second-order circuits, encompassing RLC circuits and circuits with dual capacitors or inductors (RC and RL circuits). Second-order circuits are identified by second-order differential equations that link input and output signals.
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First-order electrical circuits, which comprise resistors and a single energy storage element - either a capacitor or an inductor, are fundamental to many electronic systems. These circuits are governed by a first-order differential equation that describes the relationship between input and output signals.
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In a balanced four-wire wye-to-wye system, the arrangement involves wye-connected sinusoidal voltage sources and loads, connected through a neutral wire that links the neutral nodes of the source and load. The load impedance is connected across each phase of the load. The wye-connected source can be connected to the wye-connected load in four-wire and three-wire arrangements. A three-phase system is considered balanced when the load on each phase is equal, leading to uniform current flow and...
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LC Circuits01:21

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An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...
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Highly Flexible Transistor Threads for All-Thread Based Integrated Circuits and Multiplexed Diagnostics.

Rachel E Owyeung1,2, Trupti Terse-Thakoor3,2, Hojatollah Rezaei Nejad3,2

  • 1Department of Chemical and Biological Engineering , Tufts University Science and Technology Center , 4 Colby Street , Medford Massachusetts 02155 , United States.

ACS Applied Materials & Interfaces
|August 6, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed novel thread-based transistors (TBTs) and integrated them with sensors for wearable diagnostic devices. This innovation enables flexible, real-time biomarker monitoring directly on the skin.

Keywords:
flexible bioelectronicsionogel gated transistorsmultiplexed sensorsthread diagnosticsthread-based transistorswearable devices

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Area of Science:

  • Bioelectronics and flexible electronics
  • Materials science for wearable sensors
  • Nanotechnology for integrated circuits

Background:

  • Real-time human biomarker monitoring is crucial for modern medicine and wellness.
  • Advances in soft, flexible materials and bioelectronics enable wearable monitoring.
  • Textile fibers offer superior flexibility and processing for flexible devices.

Purpose of the Study:

  • To realize flexible transistors on threads for logic gates and integrated circuits.
  • To develop an all-thread based multiplexed diagnostic device by interconnecting transistors and sensors.
  • To create a substrate-free, highly flexible, and conformal wearable diagnostic platform.

Main Methods:

  • Fabrication of thread-based transistors (TBTs) using a gel of silica nanoparticles and ionic liquid for electrolyte gating of a carbon nanotube network.
  • Assembly of carbon nanotube semiconducting networks on textile threads.
  • Interconnection of TBTs with thread-based electrochemical sensors (TBEs) to form a diagnostic device.

Main Results:

  • Successful realization of unique flexible transistors on threads.
  • Demonstration of logic gates and small-scale integrated circuits using interconnected TBTs.
  • Creation of an all-thread based multiplexed diagnostic device integrating TBTs and TBEs.

Conclusions:

  • Thread-based transistors and sensors offer a highly flexible, conformal, and substrate-free platform for wearable diagnostics.
  • This technology allows for direct skin wear or transdermal suturing for continuous biomarker monitoring.
  • The developed all-thread based system advances the field of wearable bioelectronics for personalized health.