Fluorine plasma treatment of bare and nitrilotris(methylene)triphosphonic acid (NP) protected aluminum: an XPS and ToF-SIMS study

Abstract

Nitrilotris(methylene)triphosphonic acid (NP) is a technologically important molecule that has been used for years as a corrosion inhibitor and/or adhesion promoter on aluminum and other metal surfaces. However, to the best of our knowledge, the detailed surface characterization of NP adsorbed on aluminum, or on any other surface, has not been reported. Herein, we report an X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry (ToF-SIMS) analysis of a series of untreated and NP-coated aluminum substrates that were exposed to the downstream products of a fluoroalkane + oxygen plasma for different amounts of time (from 0 to 20 s). As indicated by P 2p, N 1s, Al 2p, O 1s, and F 1s narrow scans, even a 4-s plasma treatment significantly damages the NP protective layer and converts the native aluminum oxide into aluminum oxyfluoride. Heat treatment of the fluorine plasma-treated samples in the air substantially converts the aluminum oxyfluoride back to aluminum oxide, while similar heating under vacuum results in little change to the materials. A slow loss of fluorine from the samples occurs over the course of weeks when they are stored in the air. A ToF-SIMS analysis reveals sets of signals that are consistent with no surface treatment, NP treatment, or fluorine plasma treatment. A principal component analysis of the negative ion ToF-SIMS spectra from the samples shows the expected differentiation of the samples.

Layer‐by‐layer deposition of nitrilotris(methylene)triphosphonic acid and Zr(IV): an XPS, ToF‐SIMS, ellipsometry, and AFM study

“…The negative ion spectrum of NTMP‐coated alumina showed the expected CN − , PO − , PO 2 − , and PO 3 − peaks, which confirms the attachment of the NTMP molecule (Fig. ) . The bare alumina also yielded a CN − peak, confirming surface contamination of the substrate with nitrogen, as was observed by XPS.…”

“…5). [47,48] The bare alumina also yielded a CN À peak, confirming surface contamination of the substrate with nitrogen, as was observed by XPS.…”

Phenomenological Transition of an Aluminum Surface in an Ionic Liquid and Its Beneficial Implementation in Batteries

“…The third peak (peak 3) is associated with Al x O y F z , located at a binding energy of 76.2−76.33 eV. 33,36 The XPS measurements obtained after different exposure times of Al 2 O 3 /Al surfaces to EMIm(HF) 2.3 F revealed the Al activation mechanism in the oligo-fluoro-hydrogenate RTIL. Following the oxide growth process, only a single peak was obtained (Figure 5a), related to Al 2 O 3 /Al x (OH) y (peak 2).…”

Tailoring Microwave Electromagnetic Responses in Ti3C2Tx MXene with Fe3O4 Nanoparticle Decoration via a Solvothermal Method

“…Figure c shows the F 1s high-resolution spectrum, which mainly includes the expansion vibration peaks of F–Ti (∼685 eV) and F–Fe (∼686.6 eV), , indicating the existence of F – groups in the Ti 3 C 2 T x /Fe 3 O 4 composites. Also, the combination of F – with positively charged metal ions will neutralize the charge of final composites.…”