Adsorption induced surface-stress sensing signal originating from both vertical interface effects and intermolecular lateral interactions.
This research investigates the origin of specific molecule-adsorption induced surface-stress for micro/nano-cantilever bio/chemical sensors. Systematic discussion is presented on the contribution from types of molecule interactions to the generated surface-stress sensing signal. With the main arguments verified by our micro-cantilever sensing experiments, the origin of the adsorption induced surface-stress is, for the first time, clearly categorized into interface vertical effects and lateral interactions, which helps to comprehensively understand the surface-stress generation and overall to optimize the sensing performance of micro-cantilever chemo-mechanical sensors. The key findings of this research are that, vertically at the molecule adsorption surface, interfacial energy change and charge redistribution are the main origins of the generated surface-stress. More importantly, intermolecular lateral interactions may make a more significant contribution to the nano-mechanical surface-stress response. Compared with other lateral interactions like van der Waals force and the electrostatic coulombic effect, intermolecular hydrogen-bond intensity and steric factor easily cause much greater disparity in surface-stress.
State Key Lab of Transducer Technology, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai, PR China.
Tiantian
T
Yang
Xinxin
X
Li
Ying
Y
Chen
Dong-Weon
DW
Lee
Guomin
G
Zuo
D015097:3-Mercaptopropionic Acid / Q000737:chemistry; D000327:Adsorption; D000588:Amines / Q000032:analysis; D004277:DNA, Single-Stranded / Q000737:chemistry; D055664:Electrochemical Techniques; D005740:Gases / Q000737:chemistry; D006046:Gold / Q000737:chemistry; D006860:Hydrogen Bonding; D036103:Nanotechnology; D012822:Silicon Dioxide / Q000737:chemistry; D055672:Static Electricity; D013499:Surface Properties; D014303:Trinitrotoluene / Q000032:analysis
D000588:Amines; D004277:DNA, Single-Stranded; D005740:Gases; D014303:Trinitrotoluene; D006046:Gold; D012822:Silicon Dioxide; D015097:3-Mercaptopropionic Acid