The present disclosure relates, according to some embodiments, to antimicrobial agents comprising nitric acid, tetraethylorthosilicate, tetraethyl phosphate, zinc nitrate, and gallium nitrate. Antimicrobial agents may also include borane-tert-butylamine. Antimicrobial agents restrict and/or prevent the growth of at least one bacteria and/or at least one fungus. Bacteria may include, for example, Actinomyetes (e.g., Nocardia), Salmonella, Escherichia, Staphylococcus (e.g., Staphylococcus Aureus), Enterobacter (e.g., Enterobacter aerogenes), and/or Bacillus. Fungi may include, for example, Stachybotrys, Fusarium, Aspergillus (e.g., Aspergillus flavus), Penicillium, Candida (e.g., Candida albicans), Paracoccidiodes, and/or Trycophyton.