As I know, Near IR peak intensity is much lower and complexity than FT-IR.
However, many researcher using NIR for quantitative analysis.
What is the advantage of using it?
Depending on the nature of the analyte, specific NIR absorption can be envisaged. For example, several classes of bis(dithiolene) metal complexes feature electrochromic very intense absorption in the NIR region (1000-1800 nm). In the case of organic compounds the overtones of vibrational bands (that may be covered in the MIR region) can be detected (see for example J. Colloid Interface Sci., 2015, 448, 320–330).
I believe Massimiliano highlights some very interesting properties of NIR spectroscopy. Additionally, there are other motivations behind the use of NIR spectroscopy, especially when compared to FT-IR. These include:
Instrumentation and Cost: NIR spectrometers are often more compact and less expensive than FTIR spectrometers. This can be advantageous for laboratories with budget constraints or those requiring multiple instruments for different applications.
Sample Presentation: NIR spectroscopy is less sensitive to the physical state of the sample. It can analyze samples in various forms, including powders, granules, liquids, and solids, without the need for extensive sample preparation. In contrast, FT-IR might require specific sampling devices or sample preparation.
Penetration Depth: NIR radiation penetrates further into samples than mid-infrared (MIR) radiation used in FTIR spectroscopy. This property allows NIR to analyze thicker samples, providing more representative measurements, especially in heterogeneous materials.
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