There are various techniques for applying nanoparticle coatings, each suited to different types of substrates and desired outcomes. Spray coating, dip coating, and electrophoretic deposition are some commonly used methods. These techniques allow for the uniform distribution of nanoparticles over the surface, ensuring consistent performance. Additionally, advanced methods such as atomic layer deposition (ALD) and chemical vapor deposition (CVD) are employed for more precise control over coating thickness and composition.