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Questions and Answers
What constitutes a nanosensor?
What constitutes a nanosensor?
Which type of sensor is used in the early diagnosis of diabetes mellitus?
Which type of sensor is used in the early diagnosis of diabetes mellitus?
What is a feature of cantilever array sensors?
What is a feature of cantilever array sensors?
What is the mass detection limitation of NEMS cantilevers for cancer diagnostics?
What is the mass detection limitation of NEMS cantilevers for cancer diagnostics?
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What specific application is facilitated by nanotube sensors?
What specific application is facilitated by nanotube sensors?
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How do cantilever array sensors detect viruses and bacteria?
How do cantilever array sensors detect viruses and bacteria?
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What does the cantilever design of sensors allow for during operation?
What does the cantilever design of sensors allow for during operation?
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What type of applications can nanosensors contribute to in terms of diagnostics?
What type of applications can nanosensors contribute to in terms of diagnostics?
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Study Notes
What is a Nanosensor?
- A sensor operating at the scale of atoms and molecules
- Small size, low weight, modest power requirements
- Transducers convert input to an electric signal
- Detectors sense action and detect changes
Nanosensor Technology
- Physical sensors: Measure physical quantities like temperature, pressure, and light
- Chemical sensors: Detect chemical substances, such as gases, liquids, and biological molecules
- Biosensors: Specifically designed to detect biological molecules; consist of bioreceptors, transducers, and detectors
Types of Nanosensors
- Cantilever Array Sensors: Utilize micro-electromechanical systems (MEMS) to detect changes in surface tension
- Nanotube Sensors: Employ nanotubes as the sensing element, capable of detecting molecules at very low concentrations
- Nanowire Sensors: Utilize nanowires as the sensing element for detecting changes in electrical conductivity
Cantilever Array Sensors
- Working Mechanism: Biochemical or physical processes interact with the cantilever causing it to bend or vibrate
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Features:
- High precision cantilevers with a 300nm thickness tolerance
- Precise resonance frequency achieved through special cantilever mounting
- Easy handling and contamination-free storage due to vertical chip sidewalls and optional non-sticking coating
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Specifications:
- Size/Shape: Rectangular silicon bars, 2.5mm wide and 3mm high
- Duosensis Sensors: Contain two cantilevers per chip
- Octosensis Sensors: Contain eight cantilevers per chip
Applications of Nanosensors
- Diabetes Mellitus Diagnosis: Detects small amounts of acetone in breath, potentially indicating early onset of diabetes
- Bacteria, Fungi, and Virus Detection: Antigens on cell membrane surfaces cause mass loading on cantilevers, enabling highly sensitive detection
- Cancer Diagnosis: Binding of cancer-associated molecules to cantilevers alters surface tension leading to cantilever bending, enabling cancer detection
- Blood Glucose Monitoring: Nanotube sensors with glucose oxidase can detect glucose levels in blood by measuring hydrogen peroxide production
Nanotube Sensors
- Size/Shape: Coated with strands of DNA, capable of detecting molecules at one part per million
- Platform: Can detect molecules from air or liquid, suggesting applications in security and medical detection
- Blood Glucose Monitoring: Enzyme glucose oxidase attached to the nanotube converts glucose to hydrogen peroxide, allowing measurement of blood glucose levels
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Description
Explore the fascinating world of nanosensors and their diverse applications in sensing technology. This quiz delves into the types of nanosensors, including physical, chemical, and biosensors, as well as specialized sensors like cantilever array, nanotube, and nanowire sensors. Test your knowledge of how these tiny devices operate and their significance in various fields.
