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Questions and Answers
What is the primary material of the core in a nanowire?
Which type of nanowire morphology is characterized by having multiple branches?
Which synthesis method is NOT mentioned as a way to control the structure of nanowires?
What aspect of E-beam lithography enables the creation of patterns without the use of masks?
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Which of the following materials can constitute the shell of a nanowire?
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What is the maximum resolution that E-beam lithography can achieve?
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Which synthesis method involves liquid and solid phases for nanowire growth?
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What type of materials are typically used as the surface of nanowires?
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Study Notes
Nanowire Structure
- Nanowires have a core, shell, surface and interfaces.
- The core contains the primary material.
- Some nanowires have a shell of a secondary material.
- The surface can be functionalized with chemicals or other materials.
- Interfaces occur where nanowires meet substrates or other nanowires.
- Nanowires can be composed of metals like gold, silver, and copper.
- Semiconductors such as silicon, and germanium are also used.
- Nanowires can be made from insulators like silicon dioxide and alumina.
- Conducting polymers like PEDOT and PANI can also be used.
Nanowire Shapes
- Straight nanowires are common.
- Bent or curved nanowires can be created.
- Branched or tree-like nanowires have highly complex structures.
- Core-shell nanowires have a distinct core and surrounding shell.
- Hollow nanowires have a central cavity.
Nanowire Synthesis Methods
- Vapor-liquid-solid (VLS) growth is a popular technique.
- Solution-liquid-solid (SLS) growth is another method.
- Chemical vapor deposition (CVD) is commonly used.
- Molecular beam epitaxy (MBE) offers precise control over nanowire growth.
- Electrochemical deposition is a simple and versatile technique.
Electron-Beam Lithography (EBL)
- EBL uses a focused beam of electrons to create high-resolution patterns on a substrate.
- This technique is crucial for microelectronic and nanotechnology applications.
- A resist material changes its chemical structure when exposed to the electron beam.
- The beam is scanned across the substrate to create a pattern in the resist material.
- EBL achieves resolutions down to 10 nm or smaller.
- No mask is required, as the pattern is created directly on the substrate.
EBL Applications
- Microelectronics: fabrication of integrated circuits, transistors, and other semiconductor devices.
- Nanotechnology: creation of nanostructures, such as nanowires, nanotubes, and nanoparticles.
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Description
Explore the fascinating world of nanowires, including their structure, shapes, and synthesis methods. This quiz covers key concepts such as core-shell configurations, material compositions, and various growth techniques. Test your knowledge on the characteristics and applications of nanowires.
