Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Frequency Shift of Carbon-Nanotube-Based Mass Sensor Using Nonlocal Elasticity Theory | Nanoscale Res Lett 2010 5 1774-1778 DOI s11671-010-9709-8 NANO EXPRESS Frequency Shift of Carbon-Nanotube-Based Mass Sensor Using Nonlocal Elasticity Theory Haw-Long Lee Jung-Chang Hsu Win-Jin Chang Received 15 May 2010 Accepted 19 July 2010 Published online 1 August 2010 The Author s 2010. This article is published with open access at Abstract The frequency equation of carbon-nanotubebased cantilever sensor with an attached mass is derived analytically using nonlocal elasticity theory. According to the equation the relationship between the frequency shift of the sensor and the attached mass can be obtained. When the nonlocal effect is not taken into account the variation of frequency shift with the attached mass on the sensor is compared with the previous study. According to this study the result shows that the frequency shift of the sensor increases with increasing the attached mass. When the attached mass is small compared with that of the sensor the nonlocal effect is obvious and increasing nonlocal parameter decreases the frequency shift of the sensor. In addition when the location of the attached mass is closer to the free end the frequency shift is more significant and that makes the sensor reveal more sensitive. When the attached mass is small a high sensitivity is obtained. Keywords Carbon nanotube Mass sensor Nonlocal elasticity theory Frequency shift Introduction Carbon nanotube CNT have many potential applications in nanobiological devices and nanomechanical systems because of excellent mechanical properties chemical and . Lee . Hsu . Chang Department of Mechanical Engineering Kun Shan University Tainan 71003 Taiwan e-mail changwj@ thermal stability and hollow geometry 1 -4 . In addition the CNT is ultralight and is highly sensitive to its environment changes. Therefore many researchers have explored the potential of using CNT as nanomechanical resonators in atomic-scale mass sensor 5-7 . For example .
