SPR: um sensor SPR portátil e independente baseado no chip SPREETA e microcontrolador de placa única

Abstract

Since the announcement of the SPREETA chip, the construction of surface plasmon resonance (SPR) based sensors becomes less complex once this chip encapsulates the main optical-electronic components in a single casing. Associated with instrumentation based on single-board microcontroller (SBM), the development of portable and miniaturized SPR sensors is becoming more and more viable. However, many projects of SPR sensors that use SPREETA and SBM still require connection to a computer for control and operation, with incipient integration between hardware and software, leading to field-deployment applications being unfeasible. This work presents a stand-alone portable SPR sensor based on SPREETA and SBM Arduino. The sensor works without the need for other equipment, computers, or connections. Composed of modular parts, manufactured using a 3D printer, encapsulate the required components, the peristaltic pump, and the touchscreen. The embedded software was specially developed to perform the acquisition, control, processing, display, and storage of the SPR response. To demonstrate the sensor feasibility, experiments with aqueous solutions were carried out, reaching a sensitivity value of 123°/RIU, similar to other sensor designs.