Nitrogen-Doped Diamond Film for Optical Investigation of Hemoglobin Concentration

• Main Authors: Daria Majchrowicz, Monika Kosowska, Kamatchi J. Sankaran, Przemysław Struk, Michał Wąsowicz, Michał Sobaszek, Ken Haenen, Małgorzata Jędrzejewska-Szczerska
• Format: Article
• Language: English
• Published: MDPI AG 2018-01-01
• Series: Materials
• Subjects: nitrogen-doped diamond; fiber optic sensor; interferometer; hemoglobin; Fabry–Pérot sensor; biophotnic sensor
• Online Access: http://www.mdpi.com/1996-1944/11/1/109
• ISSN: 1996-1944

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.