Carbon nanomaterials, including fullerenes, carbon nanotubes (CNTs), and graphene, have attracted significant attention due to their unique electronic, optical, and mechanical properties. Despite challenges in structural uniformity and assembly, recent advances in synthesis and purification have renewed interest in their applications in electronics, optoelectronics, photovoltaics, and sensing. This review focuses on the latest examples using high-purity samples, comparing the suitability of fullerenes, CNTs, and graphene for various applications. The article highlights the importance of sorting and purification techniques to achieve monodisperse materials, which are critical for reliable device performance. It also discusses the potential of carbon nanomaterials in digital electronics, optoelectronics, and RF circuits, emphasizing their high field-effect mobility, low capacitance, and high cutoff frequencies. The review covers recent developments in CNT-based transistors, including their use in flexible and large-area electronics, and their potential in RF applications. Challenges remain in achieving uniform performance and large-scale integration, but significant progress has been made in improving the quality and scalability of carbon nanomaterials. The article concludes with a perspective on future research directions and the potential of carbon nanomaterials in next-generation electronic and optoelectronic devices.Carbon nanomaterials, including fullerenes, carbon nanotubes (CNTs), and graphene, have attracted significant attention due to their unique electronic, optical, and mechanical properties. Despite challenges in structural uniformity and assembly, recent advances in synthesis and purification have renewed interest in their applications in electronics, optoelectronics, photovoltaics, and sensing. This review focuses on the latest examples using high-purity samples, comparing the suitability of fullerenes, CNTs, and graphene for various applications. The article highlights the importance of sorting and purification techniques to achieve monodisperse materials, which are critical for reliable device performance. It also discusses the potential of carbon nanomaterials in digital electronics, optoelectronics, and RF circuits, emphasizing their high field-effect mobility, low capacitance, and high cutoff frequencies. The review covers recent developments in CNT-based transistors, including their use in flexible and large-area electronics, and their potential in RF applications. Challenges remain in achieving uniform performance and large-scale integration, but significant progress has been made in improving the quality and scalability of carbon nanomaterials. The article concludes with a perspective on future research directions and the potential of carbon nanomaterials in next-generation electronic and optoelectronic devices.