Single-particle counting of quantum dots

摘要

Lawrence Johnson and Chun-yang Zhang at York College of the City University of New York have developed a method to quantify quantum dot (QD) concentration via single-particle counting.QD concentration is usually measured using either absorption or fluorescence spectroscopy,but the absorption coefficient and quantum yield values for QDs vary with conditions such as pH and ionic strength.For a successful quantification by these means,the absorption coefficient or quantum yield must be determined separately under each set of conditions by laborious and time-consuming techniques.