The versatility of polyelectrolyte multilayers, PEMs, is high, which makes them interesting for e.g. biomedical applications. The functionality is largely determined by the layer properties, which needs to be understood to be tailored. Here, we show how PEMs can be characterized with QCM-D.How does QCM-D work? Perhaps you know that a QCM-D sensor is made out of quartz, which is a piezoelectric material. But what does that really mean? Get updates from the blog directly to your inbox.