In 1992–1994 he was on sabbatical at National Institute of Standards and Technology (NIST), where he studied the effect of the defect structure of CVD diamond on its growth and properties.
1992-1994年，他在国家标准与技术研究所公休，在那里他研究了CVD金刚石的缺陷结构对其增长和属性的影响。