ABSTRACT
Carbon nanotube (CNT) is a graphene sheet rolled up to form a tube-like shape. CNTs exist in two forms: single-walled CNTs (SWCNTs)having only one wall and multi-walled CNTs (MWCNTs) having two or more walls. The physical properties of SWCNTs and MWCNTs differ significantly from each other; thus, which type of CNT be chosen depends on the types of applications, in particular, for electronic device applications. In this chapter, we first present the basic structure of CNTs and their physical properties. To understand the transport process in CNTs, ballistic transport and quantum conductance phenomena are explained in detail, which is followed by structure and electronic properties of CNT two-probe devices. Besides, this chapter deals with the transport properties of pristine and doped carbon nanotube field-effect transistors (CNTFETs) and their operations. Application of CNTs in logic gates are also given in detail which form the basic building blocks of computer logic circuits. In addition, important applications of CNTs, i.e., different types of sensors such as gas sensor, biosensors, and optical sensors, are presented in detail.
