APTES-Based Silica Nanoparticles as a Potential Modifier for the Selective Sequestration of CO Gas Molecules.

In this work, we have described the characterization of hybrid silica nanoparticles of 50 nm size, showing outstanding size homogeneity, a large surface area, and remarkable CO sorption/desorption capabilities. A wide battery of techniques was conducted ranging from spectroscopies such as: UV-Vis and IR, to microscopies (SEM, AFM) and CO sorption/desorption isotherms, thus with the purpose of the full characterization of the material. The bare SiO (50 nm) nanoparticles modified with 3-aminopropyl (triethoxysilane), APTES@SiO (50 nm), show a remarkable CO sequestration enhancement compared to the pristine material (0.

2-D organization of silica nanoparticles on gold surfaces: CO marker detection and storage.

A single layer of silica nanoparticles with an average size of ∼200 nm was deposited over the surface of pristine gold wafers, aided by (3-mercaptopropyl)trimethoxysilane. The nanoparticle immobilization was driven by covalent bonding rather than a self-assembly process, leading to a cluster-assembled material which has CO sensing features. Here, we show how this device can be used for CO physisorption and chemisorption.