A method for bonding together two substrates includes providing a molecular glue including glue molecules, each of the glue molecules having at least two —；O—；Si or —；O—；Al moieties； reacting a surface of a first substrate with the molecular glue to attach the glue molecules to the surface of the first substrate by at least one of the —；O—；Si or —；O—；Al moieties； and reacting a surface of a second substrate with the molecular glue to attach the glue molecules to the surface of the second substrate by at least another one of the —；O—；Si or —；O—；Al moieties. The method can be used for a variety of applications including manufacturing a vapor cell.
