Evaluation of closed-vessel microwave digestion method for the determination of trace impurities in polymer-based photoresist by inductively coupled plasma mass spectrometry |
| |
Authors: | Yun-Chang Sun Chu-Jung Ko |
| |
Affiliation: | a Nuclear Science and Technology Development Center, National Tsing-Hua University, 30043 Hsinchu, Taiwan, ROC;b Department of Nuclear Science, National Tsing-Hua University, 30043 Hsinchu, Taiwan, ROC |
| |
Abstract: | A closed microwave digestion method followed by inductively coupled plasma spectrometric (ICP-MS) analysis was evaluated for the determination of trace impurities in photoresist. To optimize the digestion procedure, several digestion parameters such as acid, heating temperature and heating time were evaluated. Besides, the digestion efficiency of used photoresist material and the recovery of analyte elements obtained by the use of gravimetric method and ICP-MS measurement, individually, were also compared to clarify the completeness of digestion. According to our experiments, the gravimetric method was found to be not so relevant to the completeness of digestion, because the remaining sample matrix could cause suppression effect in the subsequent ICP-MS measurement. In view of minimizing blank value and working time, a simple single-step heating program was proposed to mineralize 0.25 ml of photoresist material with 5 ml of nitric acid at 180 °C for 10 min. Based on the comparative study of the analytical results obtained by instrumental neutron activation analysis (INAA) and proposed method, the reliability of proposed method for the determination of trace metallic impurities in photoresist material has been confirmed. |
| |
Keywords: | Photoresist Microwave digestion ICP-MS Neutron activation analysis |
本文献已被 ScienceDirect 等数据库收录! |
|