Premium grade glass coverslips

Tetraethylorthosilicate
(TEOS), CytC (from equine heart), 2, 2′-azino-bis(3-ethylbenzothiazoline-6-sulfonic
acid) diammonium salt (ABTS), and Coomassie Brilliant Blue G-250 were
purchased from Sigma-Aldrich. Phosphoric acid and hydrogen peroxide
(30% solution) were purchased from EMD Millipore. HRP was purchased
from Gold Biotechnology. Guaiacol was purchased from Cayman Chemical
Company. Premium grade glass coverslips (25 mm × 25 mm ×
1 mm) were purchased from Fisher Scientific. All chemicals and materials
were used as received, with the exception of the glass coverslips,
which were cleaned prior to use. All UV–vis spectra were obtained
via a Shimadzu UV-2101PC UV–vis spectrometer.

Tetraethylorthosilicate
(TEOS) and 600 and 2500 MW branched polyethylenimines (BPEIs) were
purchased from Sigma-Aldrich. The 600 MW BPEI has a primary/secondary/tertiary
amine ratio of 1:2:1, respectively, and the 25 000 MW BPEI
has a ratio of 1:1.2:0.76. Phosphoric acid was purchased from EMD
Millipore. Premium-grade glass coverslips (25 mm × 25 mm ×
170 μm) were purchased from Fisher Scientific. All chemicals
and materials were used as received, with the exception of the glass
coverslips, which were cleaned prior to use. All UV–vis spectra
were obtained via a Shimadzu UV-2101PC UV–vis spectrometer.