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Fabrication of Si-based AFM Probe with High Q-factor for Fast Non-Contact Mode Scanning
반세빈,최수봉,박웅규,정해용,박경호 한국물리학회 2019 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.74 No.2
In non-contact atomic force microscopy, a feedback loop is used to maintain the set-point fre- quency relative to the force between the specimen and the cantilever. The quality factor of the cantilever aects the sensitivity of feedback loop. Therefore, the fabrication of a high-quality-factor cantilever to improve the scan speed of non-contact atomic force microscopy is highly desirable. Here, we optimized the thickness of the non-contact atomic force microscope's cantilever to max- imize the quality factor with a high resonant frequency. These maximized values reached about 1200 and 530 kHz, respectively. The corresponding scan rate was more than 0.12 mm/s, indicating that the cantilever can be used in high-speed non-contact atomic force microscopy.
An Optimization of Electrochemical Etching Conditions for Gold Nanotips Fabrication
오민우,정해은,박두재,장문규,반세빈,최수봉 한국물리학회 2018 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.72 No.9
We demonstrate a series of experiments to find optimized electrochemical etching condition for fabricating gold nanotip, using square-wave voltage as a bias and using hydrochloric acid diluted by acetone as an etchant. We confirmed that the dilution ratio of 3 : 1 between hydrochloric acid and acetone give the smallest tip apex diameter which reproduces our previous result. More importantly, by varying applied bias condition and immersion depth of the platinum ring used as a cathode inside the etchant, we found that the smaller tip apex diameter is achieved when both the amplitude and duty cycle get higher. The success rate, which we define the number of tips having meaningfully less diameter out of total number of tried tips, is also discussed.