A sensor array is an artificial olfactory system based on the array analysis method. On an array, information from different sensing units could be collected simultaneously, which improves the analysis efficiency of the sensors. This high-throughput sensing mode has broad application prospect in the areas such as public safety, environmental monitoring and medical diagnosis. Among different kinds of sensor arrays, optical chemical sensor arrays have attracted much attention because of their high sensitivity and abundant output signal types. In recent years, for further improving the identification ability and sensitivity of the arrays, functional nanomaterials have been widely applied in optical chemical sensor arrays for increasing sensing materials and developing new sensing methods. The present review introduces the applications of functional nanomaterials in optical sensor arrays which can be classified into fluorescent arrays, colorimetric arrays, cataluminescence arrays and multidimensional arrays according to the type of spectroscopic detection technology.

Contents
1 Introduction
2 Fluorescent sensor array
2.1 Sensor array based on gold nanoparticles
2.2 Sensor array based on fluorescent gold nanoclusters
2.3 Sensor array based on graphene
3 Colorimetric sensor array
3.1 Sensor array based on nanoporous pigments
3.2 Sensor array based on gold nanoparticles
3.3 Sensor array based on peroxidase mimic enzyme
4 Cataluminescence sensor array
5 Multidimensional sensor array
6 Conclusion and outlook