To optimize imaging from the TEM a beam alignment should be done prior to use. A tool for this alignment is a holey grid. A holey grid is really a TEM grid support coated with a thin plastic movie as well as a stabilizing carbon layer.Vi?c l?a ch?n lo?i decal ?? in tem dán r?t quan tr?ng. ??i v?i các dòng s?n ph?m ???c b?o qu?n trong môi tr??ng