Two-dimensional layered double hydroxides for advanced sensors

Sensor technology is considered to be one of the three pillars of modern information technology and has a wide range of applications in many fields. As an emerging two-dimensional (2D) material, layered double hydroxides (LDHs) have attracted more interests in sensor applications due to the characteristics such as layered structure, large surface area, unique exchangeability of intercalated anions and environmental friendliness. The unique structure and surface properties of LDHs have enabled them to be utilized in a broad application in electrochemical, optical, photodetectors, humidity, and gas sensor. However, a comprehensive review on this topic is still lacking in this field. In this paper, the research progress of LDHs in sensor field is summarized. Firstly, the development process and structural characteristics of LDHs is introduced. Secondly, the characteristics of common synthesis methods of LDHs are discussed. Thereafter, we systematically describe the great potential of LDHs in sensor applications, including electrochemical, optical, photodetectors, humidity and gas sensors. Finally, based on the current state of technology, we summarize the challenges and future prospects in this field.