Optical chemical sensors on the base of arrays of ink-jet printed micro- and nanoparticles
M.V. Alfimov, V.A. Sazhnikov, A.A. Khlebunov, D.S. Ionov, A.N. Petrov, V.M. Aristarkhov, A.Y. Men’shikova, N.N. Shevchenko, A.V. Yakimansky, D.V. Kalinin, A.I. Plekhanov
Photochemistry Center of RAS, RU
Keywords: fluorescence, intermolecular charge transfer, nanoparticle, self-assembling, ink-jet printing
Abstract:Array-based optical chemical sensors is a topic of growing interest for researchers. The main advantage of such systems is the possibility of optimizing the performance of sensor array by means of “tuning” individual sensor elements. Two conditions are required for realizing the opportunity: a rational approach to the synthesis of the sensor materials and the use of fabrication technology allowing production of materials with different properties. In this work, we have studied a photochemical method for producing sensor materials and have used the ink-jet printing technology for formation of sensor arrays. The optical sensor is an organized array of sensor elements, each of which is an ensemble of micro- and nanoparticles with indicator dyes immobilized on their surface. Therefore, the sensor is a device which has hierarchical structure with the following levels of hierarchy: indicator dye, sensor material (indicator dye + particle), sensor element (ensemble of particles), array. Several parameters can be “tuned” for the optimization of the sensor array performance (e.g. the structure of used indicator dye, method of the indicator immobilization (covalent or non-covalent), material of the particle, functional groups on the particle surface, etc.). For the rational design of sensor materials, the main interactions in matrix-indicator dye-analyte systems must be analyzed.