**5. Conclusions**

In conclusion, the nano-BFO is a suitable multiferroic nanomaterial with a few unique features, including high polarization of residue, magnetoelectric composite at room temperature, and small bandgap. It also serves as a flexible platform for exploring new novel works. This review of the topic focuses on significant improvements made in the study of integrating nano-BFO-based materials, features, structures, and applications. Several operational strategies have been proposed. Proper substrate selection and morphotropic phase boundary formation have been widely used in the modification to improve ferroelectric efficiency and magnetic field. The impact of size on behavior on nano-BFOs is also a significant problem.

Efforts to achieve outstanding results have been made on fixed memory, piezoelectric sensors, and photodetectors. However, many challenges remain until those modern facilities are completed. First and foremost, it is essential to improve the efficiency of ferroelectric and magnetoelectric energy. The nano-BFO is highly fragmented. Is it possible to achieve high polarization of ferroelectric power? Will nano-BFO devices show a broad magnetoelectric response at room temperature? Second, should sufficient switching speed be required for systems based on ferroelectric or ferromagnetic switching? Most of the recorded speed of change and the durability of the switch does not meet the memories of the universe. As a result, there has been a long way to go to increase memory on nano-BFO-based devices. Third, the physiological processes under the influence of photovoltaic and photocatalytic activity in nano-BFO remain a mystery. BFO photocatalyst and photovoltaic devices are expanded only by exposing the visible structures. Several ideas have been suggested; however, there is much disagreement, and further research is needed. Fourth, only a few nano-material structures have been observed to reflect composite structures. Many nanomaterial systems should be built to investigate the potential for new applications. With this review, we hope to provide a current summary of the problems and opportunities that arise, which may inspire more researchers to pursue future nano-BFO production.

*Synthesis and Characterization of NanoBismuth Ferrites Ceramics DOI: http://dx.doi.org/10.5772/intechopen.104777*
