Hydroxyapatite (HAp) is a bioceramic widely studied due to its chemical similarity with the mineral component of bones. Besides, it is biocompatible, bioactive and thermodynamically stable in the body fluid what poses it as an attractive material for a wide range of applications in the biomedical field. Several efforts have been focused on the synthesis of particles of this material aiming to the precise control of size and morphology, porosity and surface area. HAp is widely used as an implant for bone tissue regeneration, as a coating for metallic implants and in a drug-controlled release. In this sense, the objective of this review is to gather information related to HAp, providing readers with information about synthesis methods, material characteristics and their applications.

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Tin dioxide (SnO 2) gas sensors with reliable sensing properties and low-cost are most desired for application in the detection of hazardous gases in heavy industries, 1,2 in-house safety monitoring, 3 and food quality control. 4 Most SnO 2based gas sensors are formed by a single heated layer of sensing material deposited over a pair of electrodes, which usually needs high operating temperatures (200-400ºC) to achieve their most desirable sensing response. 3,

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