Cognitive radio-Internet of Things is a new technology that has come to light in recent years. It refers to the integration of Cognitive Radio Networks capabilities within the Internet of Things devices. CR-IoT networks are designed to solve the spectrum scarcity problem in wireless communication systems. It is a powerful key solution that permits Internet of Things objects to overcome the challenges of the limited available bands of the radiofrequency spectrum; making its utilization more efficient and smoother and without harmful interference with other devices. CR-IoT networks enable dynamic spectrum access for Internet of Things devices which are defined as secondary users to opportunistically use the spectrum when it is not being used by primary users. This work stands as an open door to the world of Spectrum sensing in CR- IoT environment. It presents a bibliometric analysis that explores the landscape of research on spectrum sensing in the context of cognitive radio-based Internet of Things.