Capacitive, interdigital sensors in proximity of a PASiC thin film have been proposed as a cheap, robust alternative to existing ammonia sensing technologies. However, although prototype sensors have been manufactured, investigation into the working principles of this class of ammonia sensors is limited. This work aims to analyse the electrode and PASiC layer configuration to gain more insight into how design parameters influence the sensing capabilities of these devices.
To this end, finite element simulations and analytical simulations have been carried out to model the behaviour of the sensor configuration. The PASiC layer is modelled as a stack of layers with different permittivities, with the response to ammonia modelled as a change in the permittivity of the layers.
Using the simulation data, a lithography mask for a test-bench with varying electrode dimensions is designed to allow fabrication of devices for measuring the effects of different manufacturing parameters.
A series of prototypes created using this mask is then used to devise an etching setup to allow electrochemical etching of single chips to create the porous layer.
The results of the manufacturing process are analysed and discussed.

This BSc Thesis is about the construction and control elements of the airplane group of the Solar Drone project. The project aims to improve the flight time of aerial vehicles, using solar energy. This document is delves into the possibility of applying solar cells to small model aircrafts. It outlines the challenges and solutions involved in building and controlling such a system. A ready-available airframe and fitting components will be used, in combination with a custom photo-voltaic and energy system, to create a prototype. The prototype takes the form of an unmanned aerial vehicle, making it capable of extended flights without requiring extensive monitoring. It will serve as a testing platform for the performance of the PV modifications done to the aircraft.

Included in this document are simulations for calculating optimal solar panel placement inside a transparent wing with opaque ribs, in addition to software and hardware modifications that were required to make the other systems work well in combination with the custom energy system.