scanning electron microscope

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Scientific Image - Singlewalled Nanotube Paper

A bundle of singlewalled nanotubes processed into a thin sheet is shown in this scanning electron microscope image. Singlewalled nanotubes are extremely important in the continuing miniaturization of electronic devices. These tubes have an average diameter of 1-2 nm. Their electrical properties have led to their investigation as super capacitors for storing electrical charges.

• SIZE: The thickness of the sheet is about 50 µm.

• IMAGING TOOL: Scanning electron microscope

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Scientific Image - Indium Arsenide Nanowire Field-Effect Transistor

This scanning electron microscope image shows an indium arsenide (InAs) nanowire field-effect transistor.

Semiconductor nanowires such as those of indium arsenide (InAs) offer exciting possibilities for the electronic systems of the future because of the unique possibilities they offer for controlling fundamental properties during generation. A wide range of nanowire-based devices and systems, including transistors, circuits, light emitters, and sensors, have already been explored. Nanowire field-effect transistors have been of particular interest as vehicles for the investigation...

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Scientific Image - Indium Arsenide Nanowires

This is scanning electron microscope image of indium arsenide nanowires.

Semiconductor nanowires such as those of indium arsenide (InAs) offer exciting possibilities for the electronic systems of the future because of the unique possibilities they offer for controlling fundamental properties during generation. A wide range of nanowire-based devices and systems, including transistors, circuits, light emitters, and sensors, have already been explored. Nanowire field-effect transistors have been of particular interest as vehicles for the investigation of basic carrier-transport...

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Scientific Image - Electrospun Scaffold

This scanning electron microscope image shows an electrospun scaffold grown for studying brain tissue engineering and nerve regeneration.

Scaffolds are of great interest in tissue engineering and nerve regeneration because they form a framework on which soft tissue is supported and thereby start its regeneration process. Electrospinning is a versatile process that creates nanofibers by applying a high voltage to electrically charge a liquid. Researchers can tailor a scaffold to meet the requirements of the tissue they seek to regenerate.

• SIZE: The image displayed is about...

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Scientific Image - Zinc Oxide Nanowires

This is a scanning electron microscope image of vertical arrays of zinc oxide (ZnO) nanowires on a sapphire substrate.

Zinc oxide (ZnO) is an ideal material for nanoscale optoelectronics, electronics, and biotechnology applications. Numerous ZnO-based devices have already been developed, including nanowire field effect transistors, piezoelectric nanogenerators, optically pumped nanolasers, and biosensors.

• SIZE: The sample displayed in the image is about 10 µm wide.

• IMAGING TOOL: Scanning electron microscope

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Scientific Image - Nanomechanical Antenna Oscillator

This scanning electron micrograph depicts a silicon crystal nanomachined into an antenna oscillator that can vibrate about 1.5 billion times per second.

The antenna-type oscillator is a nanomachined single-crystal structure of silicon. Using this design, movements 1000 times smaller than nanometer scale are amplified into motion of the entire micron-sized structure. Operating at gigahertz speeds, the technology could help further miniaturize wireless communication devices like cell phones. This macroscopic nanomechanical oscillator consists of roughly 50 billion silicon atoms....

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Scientific Image - Nanoscale Interface for Spin Injection

This is a scanning electron micrograph of a nanoscale interface for spin injection in a nanomechanical torsion oscillator used for measuring tiny amounts of torque.

This interface is built on a silicon-based nanomechanical torsion oscillator, a device used to measure tiny amounts of torque. The device contains a central wire running from top left to bottom right. The top surface of one part of this wire is coated with a 50 nm layer of cobalt (which is magnetic); the top surface of the other part is coated with 50 nm of non-magnetic gold. As electrons travel from the magnetic into...

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Scientific Image - Spin Torsion Oscillator

This scanning electron micrograph shows a nanomechanical torsion oscillator used by computer engineers to measure extremely small amounts of torque.

A nanomechanical torsion oscillator is used to measure extremely small torsion or twisting forces smaller than those created by the untwisting of a strand of DNA. When current passes from magnetic into non-magnetic materials, the directional spins of the electrons flip at the boundary, producing a mechanical torque. This device can measure the torque in a metallic nanowire with unprecedented sensitivity. This approach to measuring...

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Scientific Image - Hydrogel Scaffold

This scanning electron microscope image shows a hydrogel scaffold grown for studying brain tissue engineering and nerve regeneration.

Hydrogels are polymers of great interest to researchers studying tissue engineering and nerve regeneration because they are compatible with a range of biological tissues and processes, they have mechanical properties similar to those of soft tissues, and they can be injected into tissues in liquid form. In addition, they allow living cells to assemble spontaneously on the scaffold structure.

• SIZE: The image is 100 µm wide.

• IMAGING...

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Scientific Image - Zinc Oxide Nanowire Photodetector

This scanning electron microscope image shows a zinc oxide (ZnO) nanowire photodetector device grown by photolithography.

Nanowires geometry and structure make them both sensitive to light and efficient low-noise signaling devices, so they are ideally suited for applications involving light—such as detection, imaging, information storage, and intrachip optical communications. In addition, different types of nanowires can be combined to create devices sensitive to different wavelengths of light. Zinc oxide's (ZnO) electrical, optoelectronic, and photochemical properties have led to...

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