Sensor materials are made of what

A. Sensor materials are divided into semiconductor materials, ceramic materials, metal materials and organic materials, so A is wrong;

B. Metallic materials can also be made into sensors, so B is correct;

C. Sensors must be through the conversion of non-electrical quantities into electrical quantities to transmit signals, so C is wrong;

D. From the above can be seen, so D is wrong;

故选：B