The persistent challenge for CD-AFM technology has been keeping pace with the need for smaller tips. When CD-AFM was initially developed, the ability to image a 0.5-µm trench was technologically relevant.15 The requirements for current technology are nearly a factor of 50 smaller. This has resulted in a steady evolution of CD-AFM tips toward smaller widths, but the need to maintain the lateral stiffness of tips has also meant that these tips had to be shorter. Smaller tips were even more susceptible to damage than larger ones, so there has also been development of nonsilicon CD tips, specifically those of high-density diamond-like carbon.16