To create a solution from ZnO powder for depositing a layer on glass substrates via the drop casting method, it is important to note that a suspension is typically the best achievable form without using acids, which would alter the ZnO. Nano-sized ZnO particles are recommended for creating a stable suspension, as they are commonly used in products like sunscreen and deodorants due to their ability to become transparent upon application. Additionally, incorporating a thickening agent can extend the working time of the suspension, facilitating the drop casting process.
