针尖化学的基础研究

A tip chemistry approach was employed for the studies of single molecular properties, nanometer-scale information storage, and single electron tunneling (SET) properties in various double-barrier tunneling junctions (DBTJs). With the proposed novel chemical assembling technique, we fabricated the highly-aligned assembly of single walled carbon nanotubes on solid surfaces, and also fabricated the single walled carbon nanotube SPM tips, which enabled the measurements of the chemical dissociation properties and electrical properties of individual short carboxylic carbon nanotubes. Thermochemical hole burning (THB) memory is one of the main achievements of the project, in which the STM tip-generated Joule heat was used to induce a localized thermochemical decomposition of charge transfer complexes, forming nanometer-sized holes on the crystal surface. Based on this unique hole burning effect, we have created a prototype STM memory (called THB MEMORY), and the storage density has reached as high as 1013bits/cm2. With the help of chemically tailored SPM tips, we created vertical DBTJs using metal and semiconductor nanoparticles and single walled carbon nanotubes as Coulomb islands, and successfully observed Coulomb blockade and Coulomb staircase effects at room temperature, which is critical for realizing room temperature SET devices.

按针尖化学研究思想，利用分子/纳米粒子有序组装技术，对扫描探针显微镜针尖进行化学δ芑杓疲渥魑擅状呋行模盏急砻娣⑸钟虼呋从Γ员砻娼心擅准兜幕Ъ庸ぃ⒂糜谘芯烤钟蚪饫敕从湍擅琢Ｗ拥耐夹位樽埃换菇霉δ芑爰舛垦芯糠肿蛹涞摩?-π相互作用，考察有限分子体系与宏观体系的物理化学性质的差异。..