研究目的
Investigating the conductance values of para-phthalic acid and meta-phthalic acid with Au electrodes and comparing them to those with Cu electrodes to understand the influence of electrode material on single molecular junctions.
研究成果
The conductance order between para-phthalic acid and meta-phthalic acid differs when using Au electrodes compared to Cu electrodes, highlighting the significant role of the electrode material in single molecular junctions. The breaking off distances reflect the molecular lengths, providing insights into the molecular junction formation.
研究不足
The study is limited to the comparison between Au and Cu electrodes and does not explore other metal electrodes or environmental conditions that might affect molecular conductance.
1：Experimental Design and Method Selection:
The study used the STM break junction approach to measure the conductance of single-molecule junctions at room temperature.
2：Sample Selection and Data Sources:
Para-phthalic acid and meta-phthalic acid were purchased from Alfa Aesar. Au(111) was used as substrate, and a mechanically cut Au tip was used as the tip.
3：List of Experimental Equipment and Materials:
A modified Nanoscope IIIa STM (Veeco, U.S.A.) was used for conductance measurement.
4：Experimental Procedures and Operational Workflow:
The Au substrates were immersed into a freshly prepared ethanol solution containing
5：1 M target molecules for 10 mins. Conductance measurement was carried out by repeating moving the tip into and out of contact with substrate at constant speed. Data Analysis Methods:
Thousands of conductance curves were collected for statistical analysis with a sampling rate of 20 kHz.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
