Columbia University offers a certificate in Nanotechnology.
Columbia University currently offers more than 30 online degrees with the following program options: Master of Science, Professional Degree, Certificate program, and review courses. One of the online certificates offered by the Columbia College of Engineering is in nanotechnology.
The Graduate Engineering Department, through the Columbia Video Network (CVN), offers distance postgraduate courses. CVN enables students from around the world to receive fully accredited engineering classes and degree programs over the Internet regardless of their residency. Through CVN, students can choose to pursue a Masters of Science (MS) or Professional Degree (PD).
Source: Online College Blog