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Related Concept Videos

NMR Spectroscopy Of Amines01:19

NMR Spectroscopy Of Amines

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In proton NMR spectroscopy, primary amines and secondary amines showcase their N–H protons as a broad signal in the chemical shift range between δ 0.5 and 5 ppm. The exact position in this range depends on several factors, including sample concentration, hydrogen bonding, and the type of solvent used. Since amine protons undergo fast proton exchange in solution, the protons are labile and therefore do not participate in any splitting with adjacent protons. Thus, the observed peak is...
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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Ammonia Optical Sensing by Microring Resonators.

Vittorio M N Passaro1, Francesco Dell'Olio2, Francesco De Leonardis3

  • 1Photonics Research Group, Dipartimento di Elettrotecnica ed Elettronica, Politecnico di Bari, via Edoardo Orabona n. 4, 70125 Bari, Italy. passaro@deemail.poliba.it.

Sensors (Basel, Switzerland)
|September 15, 2017
PubMed
Summary
This summary is machine-generated.

This study introduces a compact optical ammonia sensor using a microring resonator. The sensor demonstrates high sensitivity and a low detection limit for ammonia.

Keywords:
Ammonia sensorIntegrated opticsOptical sensorRing resonator

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Area of Science:

  • Optoelectronics
  • Chemical Sensing
  • Materials Science

Background:

  • Ammonia (NH3) is a critical gas with widespread industrial and environmental applications.
  • Developing sensitive and compact sensors for ammonia detection remains a significant challenge.
  • Optical sensors offer potential advantages in selectivity and miniaturization.

Purpose of the Study:

  • To present a novel, highly compact optical ammonia sensor.
  • To evaluate the performance characteristics of the developed sensor.
  • To demonstrate the sensor's applicability for ammonia detection.

Main Methods:

  • Fabrication of a microring resonator sensor using silicon-on-insulator technology.
  • Utilization of a dye-doped polymer as the sensing material for ammonia interaction.
  • Characterization of the sensor's response, including linearity and refractive index sensitivity.

Main Results:

  • The developed optical ammonia sensor has a device area of approximately 40 μm².
  • The sensor exhibits excellent linearity in its response.
  • A minimum detectable refractive index shift of 8x10⁻⁵ was achieved.
  • The sensor demonstrated a detection limit for ammonia of approximately 4 ‰.

Conclusions:

  • A highly compact and sensitive optical ammonia sensor has been successfully developed.
  • The microring resonator platform combined with a polymer sensing layer is effective for ammonia detection.
  • The sensor's performance metrics indicate its potential for practical ammonia monitoring applications.