イオンマイグレーションと超音波照射によるマイクロ/ナノ材料の創製

抄録

Electrochemical migration (ECM) is known as a cause of threating the reliability of electronic devices by generating metal or its compound deposits. ECM is a kind of electrochemical phenomenon consisting of dissolution of anodic metal into water as ions, migration of ions between electrodes caused by electrical field and deposition of metals at cathode. The occurrence condition relates with water or high humidity and voltage-applied metal electrodes, and inhibition research has been mainly performed conventionally. In recent years, some researchers are trying to utilize ECM for environmentally friendly and simple fabrication of micro/nanomaterials because the deposits take various fine structures and they can be made by just water and metal without any other chemicals. In this study, we attempted to take ECM deposits apart using physical force of ultrasonic wave in dispersion medium to obtain micro/nanomaterial dispersion. A 100-fold dilution kitchen detergent in the amount of 0.1 ml was added as a dispersion medium to deposits of 0.5 mg, and ultrasonic wave of 40 kHz was applied for 60 seconds. As a result, the deposits were taken apart and dispersed to medium. For observation with a scanning electron microscope, the dispersion was spin-coated on a copper plate. Through the observation, the presence of wire-like materials was confirmed.