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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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Scientific Image - Nanowire Photodetector

This scanning electron micrograph shows a gallium nitride nanowire photodetector device with a zinc oxide core grown by e-beam lithography.

The geometry and structure of nanowires 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.

• SIZE: The nanowire has a diameter of about 200 nm....

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Scientific Image - Silicon Nano-Biosensor

This scanning electron micrograph depicts the functional part of a nano-biosensor containing silicon nanowires. Field effect transistors are best known for their key role in computer microprocessors, but their compatibility with various microfabrication strategies has also led researchers to study them for biosensing applications. For example, glucose biosensors may lead to important innovations in the management of diabetes. The lithographic manufacturing processes involved in their production may mean that such sensors can be produced in quantity and scaled for different applications....

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Scientific Image - Silicon Nanowire Device

This scanning electron microscope image shows a silicon nanowire resting on two silicon nitride (SiNx) membranes.

Thermoelectric materials convert heat to electricity and vice versa. Most fossil-fuel-powered engines generate waste heat, so researchers are using nanotechnologies to explore ways of making thermoelectric devices more efficient in order to convert that waste heat to usable power—and thus save energy. This assembly was built to measure the thermal conductivity of a silicon nanowire synthesized specifically for thermoelectric applications.

• SIZE: The diameter of...

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Scientific Image - Silicon Nanowire Array

This is a scanning electron microscope image of a silicon nanowire array synthesized for thermoelectric applications.

Thermoelectric materials convert heat to electricity and vice versa. Most fossil-fuel-powered engines generate waste heat, so researchers are using nanotechnologies to explore ways of making thermoelectric devices more efficient in order to convert that waste heat to usable power—and thus save energy.

• SIZE: Each nanowire is approximately 100 nm in diameter.

• IMAGING TOOL: Scanning electron microscope

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Scientific Image - Gold Nanoshells (SEM)

To create this scanning electron microscope image, gold nanoshells were dispersed in a drop of water which then dried on a glass microscope slide. The colors are due to selective scattering of light by nanoscale particles.

Gold Nanoshells have a variety of uses in nanotechnology, and especially in biomedical applications. Nanoshells like these may play important roles in new kinds of cancer treatments, disease detection, and imaging techniques.

• SIZE: These gold nanoshells are each about 120 nm in diameter.

• IMAGING TOOL: Scanning electron microscope

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Scientific Image - Cholera Bacteria

The cholera bacteria in this scanning electron microscope image cause a potentially fatal disease of the digestive system.

• SIZE: These bacteria are each about 500 nm wide and 1-2 µm long.

• IMAGING TOOL: Scanning electron microscope

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Scientific Image - HIV-infected Cells

The tissue culture shown in this scanning electron microscope image is infected with the Human Immunodeficiency Virus, or HIV.

• SIZE: HIV particles are 90-120 nm in diameter.

• IMAGING TOOL: Scanning electron microscope

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Scientific Image - Single Hair from a Gecko's Foot

The feet of the gecko cling to virtually any surface. This scanning electron microscope image shows one of the branching hairs, or setae, on the sole of a gecko's foot. These hairs nestle into nanoscale niches on the contact surface.

The gecko's amazing ability to cling to vertical or inverted surfaces is due to the interaction between nanoscale structures on its feet and tiny crevices on the wall or ceiling. The soles of gecko feet are made up of overlapping adhesive lamellae covered with millions of superfine hairs, or setae, each of which branches out at the end into hundreds...

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Scientific Image - Nanotubes Mimicking Gecko Feet

The nanoscale structures on a gecko's foot enable it to cling to most surfaces. This scanning electron microscope image shows multiwalled carbon nanotubes attached to a polymer backing, an experiment designed to replicate the gecko foot's adhesive properties.

The gecko's amazing ability to cling to vertical or inverted surfaces is due to the interaction between nanoscale structures on its feet and tiny crevices on the wall or ceiling. The soles of gecko feet are made up of overlapping adhesive lamellae covered with millions of superfine hairs, or setae, each of which branches out...

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