Synthesis and characterization of tin dioxide thick film modified by APTES in vapor and liquid phases

Abstract

International audienceSurface functionalization has numerous applications worldwide. Silicon oxide has been a research material of choice. However, tin dioxide (SnO₂) films are employed in many applications especially in gas sensors, and little studied in regard to functionalization. Thus, they were chosen to be functionalized via 3-aminopropyltriethoxysilane (APTES). Different synthesis parameters were tested such as APTES grafting by vapor or liquid phases deposition. In liquid, many parameters were investigated: water presence, reaction times, and APTES concentration. The presence and reactivity of grafted amine-terminated film on SnO₂ were carried out by Alexa Fluor® molecules. In addition, APTES grafting was characterized using attenuated total reflectance Fourier transform infrared spectroscopy and X-ray photoelectron spectrometry techniques. These characterizations showed how synthesis parameters affect the amount and thickness of APTES films. Optimal liquid silanization parameters were determined in order to obtain a saturated SnO₂ surface with APTES molecules. Importantly, the addition of 5 vol% H₂O to the APTES solution provided denser surface coverage, by hydrolyzing the ethoxy groups to silanol. An almost 50% improvement over anhydrous liquid and vapor methods was obtained

Antimicrobial and Antifouling Effects of Petal‐Like Nanostructure by Evaporation‐Induced Self‐Assembly for Personal Protective Equipment

“…The high-resolution O 1s X-ray photoelectron spectra (XPS) reveal a Si─O bond near 531.9 eV and an N─C═O bond near 530.5 eV. [27,28] This indicates a shift toward a lower binding energy, which is attributed to the electron-withdrawing effect facilitated by hydrogen bonding with the amino group of ODA (Figure 1b(i)), in accordance with previous studies. [29] This conclusion is corroborated by the corresponding highresolution Si 2p spectra.…”

Capped ZnO quantum dots with a tunable photoluminescence for acetone detection

“…3(f) shows the Si 2p core-level spectrum with a main peak at 101.54 eV (100%) and is assigned to Si atom bounded to oxygen and carbon (C-Si-O) in the APTES molecule. 43,44 These results conrm that the successful capping APTES is graed or capped with ZnO QDs and is consistent with the FTIR and EDX analysis.…”

A Simple Approach to MXene Micropatterning from Molecularly Driven Assembly

“…Printing APTES yielded an XPS peak at 285.8 eV (Figure 3C), assigned to the amino carbon chemical bond (NC). 32 After immersion with GA solution, a carbonyl carbon peak (H−C O) of aldehyde was determined at 288.2 eV (Figure 3D), which confirmed the GA SAM formation. 33 The appearance of N 1s after APTES modification indicated amino monolayer formation, exhibiting two peaks at 400.1 eV for amino groups bonded to carbon (C−NH 2 ) and at 401.8 eV assigned to a protonated amino (C−NH 3 + ).…”

“…Figure B–D shows the XPS C 1s fitting results after each modification step. Printing APTES yielded an XPS peak at 285.8 eV (Figure C), assigned to the amino carbon chemical bond (NC) . After immersion with GA solution, a carbonyl carbon peak (H–CO) of aldehyde was determined at 288.2 eV (Figure D), which confirmed the GA SAM formation .…”