Abstract
In this work we present the fabrication and characterization of a diamond film which can be utilized in the construction of optical sensors for the investigation of biological samples. We produced a nitrogen-doped diamond (NDD) film using a microwave plasma enhanced chemical vapor deposition (MWPECVD) system. The NDD film was investigated with the use of scanning electron microscopy (SEM), atomic force microscopy (AFM) and Raman spectroscopy. The NDD film was used in the construction of the fiber optic sensor. This sensor is based on the Fabry–Pérot interferometer working in a reflective mode and the NDD film is utilized as a reflective layer of this interferometer. Application of the NDD film allowed us to obtain the sensor of hemoglobin concentration with linear work characteristics with a correlation coefficient (R2) equal to 0.988.
Highlights
Among the outstanding properties of diamond, biocompatibility is one of the key functions [1,2], as well as a wide range of optical transparency [3,4]
Increasing the doping level of nitrogen will affect the refractive index to change from normal to an abnormal distribution, as is observed in metals. In this manuscript we present nitrogen-doped diamond film which was used in the construction of the fiber optic sensor for optical investigation of hemoglobin concentration
The research of surface topography was focused on the structure of nitrogen-doped diamond film
Summary
Among the outstanding properties of diamond, biocompatibility is one of the key functions [1,2], as well as a wide range of optical transparency [3,4]. Nitrogen incorporation results in significant mechanical stress and increases the number of vacancy defects due to distortion of the diamond lattice [23] It has a significant impact on electrical properties and on optical properties of diamond films. Increasing the doping level of nitrogen will affect the refractive index to change from normal to an abnormal distribution, as is observed in metals. In this manuscript we present nitrogen-doped diamond film which was used in the construction of the fiber optic sensor for optical investigation of hemoglobin concentration
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