The IEEE Open Journal of Nanotechnology is one of the latest open access journals from the IEEE.
https://oj-nano.ieeenano.org
Their stated mission is:
The IEEE Open Journal of Nanotechnology (OJ-NANO) is dedicated to publishing articles on timely topics in the field of nanotechnology by making them available immediately, freely, and permanently available to all.
According to a recent email campaign, the journal is currently offering Full APC waivers for articles which are accepted before publication before November 30, 2022. I encourage prospective authors to contact the journal directly.