scholarly journals Simultaneous current, force and dissipation measurements on the Si(111) 7×7 surface with an optimized qPlus AFM/STM technique

2012 ◽  
Vol 3 ◽  
pp. 249-259 ◽  
Author(s):  
Zsolt Majzik ◽  
Martin Setvín ◽  
Andreas Bettac ◽  
Albrecht Feltz ◽  
Vladimír Cháb ◽  
...  
Keyword(s):  
Cross Talk ◽  
Tuning Fork ◽  
Tunneling Current ◽  
Quartz Tuning Fork ◽  
Scanning Tunneling ◽  
Experimental Setup ◽  
Force Microscopy ◽  
Atomic Force ◽  
Force Signal ◽  
Reported Data

We present the results of simultaneous scanning-tunneling and frequency-modulated dynamic atomic force microscopy measurements with a qPlus setup. The qPlus sensor is a purely electrical sensor based on a quartz tuning fork. If both the tunneling current and the force signal are to be measured at the tip, a cross-talk of the tunneling current with the force signal can easily occur. The origin and general features of the capacitive cross-talk will be discussed in detail in this contribution. Furthermore, we describe an experimental setup that improves the level of decoupling between the tunneling-current and the deflection signal. The efficiency of this experimental setup is demonstrated through topography and site-specific force/tunneling-spectroscopy measurements on the Si(111) 7×7 surface. The results show an excellent agreement with previously reported data measured by optical interferometric deflection.

Tip-Substrate Shear Interaction in Quartz Tuning Fork-Based Atomic Force Microscopy in Air

2021 ◽  
Vol 71 (5) ◽  
pp. 439-445
Author(s):  
Hyoju CHOE ◽  
Dongwon KIM ◽  
Manhee LEE* ◽  
Myungchul CHOI
Keyword(s):  
Atomic Force Microscopy ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals Quartz Tuning Fork Resonance Tracking and application in Quartz Enhanced Photoacoustics Spectroscopy

Sensors ◽  
2019 ◽  
Vol 19 (24) ◽  
pp. 5565 ◽  
Author(s):  
Roman Rousseau ◽  
Nicolas Maurin ◽  
Wioletta Trzpil ◽  
Michael Bahriz ◽  
Aurore Vicet
Keyword(s):  
Tuning Fork ◽  
Beat Frequency ◽  
Quartz Tuning Fork ◽  
Characterization Methods ◽  
Force Microscopy ◽  
Atomic Force ◽  
Signal Drift ◽  
Environment Temperature ◽  
Photo Acoustic Spectroscopy ◽  
Qepas Sensor

The quartz tuning fork (QTF) is a piezoelectric transducer with a high quality factor that was successfully employed in sensitive applications such as atomic force microscopy or Quartz-Enhanced Photo-Acoustic Spectroscopy (QEPAS). The variability of the environment (temperature, humidity) can lead to a drift of the QTF resonance. In most applications, regular QTF calibration is absolutely essential. Because the requirements vary greatly depending on the field of application, different characterization methods can be found in the literature. We present a review of these methods and compare them in terms of accuracy. Then, we further detail one technique, called Beat Frequency analysis, based on the transient response followed by heterodyning. This method proved to be fast and accurate. Further, we demonstrate the resonance tracking of the QTF while changing the temperature and the humidity. Finally, we integrate this characterization method in our Resonance Tracking (RT) QEPAS sensor and show the significant reduction of the signal drift compared to a conventional QEPAS sensor.

Eigenvalue Veering in Quartz Tuning Fork Sensors and its Effect on Dynamic Atomic Force Microscopy

2014 ◽  
Author(s):  
John Melcher
Keyword(s):  
Atomic Force Microscopy ◽  
Resonant Frequency ◽  
Systematic Error ◽  
Tuning Fork ◽  
Quartz Tuning Fork ◽  
Attractive Alternative ◽  
Small Shift ◽  
Force Microscopy ◽  
Sensing Applications ◽  
Atomic Force

Quartz tuning fork (QTF) sensors offer an attractive alternative to traditional silicon microcantilevers for sensing applications in dynamic atomic force microscopy (DAFM). The QTF sensor consists of two identical, weakly-coupled tines with a sharp tip affixed to the distal end of one tine. The fundamental anti-phase mode of the QTF achieves a stable resonant frequency with a high Quality factor making it ideal for DAFM applications in which a small shift in the resonant frequency is linked to a tip-sample force. The addition of the tip-sample force also breaks the symmetry of the QTF leading to a classic eigenvalue veering scenario. The eigenvalue veering and accompanying mode localization phenomena violate the standard DAFM modeling assumptions which treat the addition of the tip-sample force as a small perturbation to a single-degree-of-freedom oscillator. We find that the eigenvalue veering can contribute a systematic error in force measurements on the order of 20%. Methodology for correcting the systematic error caused by eigenvalue veering is proposed.

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