X-ray Photoelectron Spectroscopic Studies of Interactions between Poly(4-vinylpyridine) and Poly(styrenesulfonate) Salts

Goh, S. H.; Lee, S. Y.; Zhou, Xu; Tan, K.L.

doi:10.1021/ma980392i

Cited by 48 publications

(42 citation statements)

References 30 publications

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“…First, the broad composite N1s peak can be curve-fitted into 2 peaks one for the neutral -NH 2 , and the other, at ca. 1.5 eV higher binding energy, for the quaternized -NH 3 + moieties, 28 and both of these peaks shift upon change of the polarity.…”

Section: Resultsmentioning

confidence: 96%

Response of Polyelectrolyte Layers to the SiO₂ Substrate Charging As Probed by XPS

Conger

Süzer

2009

Langmuir

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A single layer of the cationic polyelectrolyte poly(allyamine) hydrochloride (PAH) deposited, using the layerby-layer technique, on a silicon substrate containing 5 nm oxide layer is investigated by XPS while applying an external potential bias to the sample to control and manipulate the charge built-up on the oxide layer. Under application of a -10 V bias, the oxide layer is positively charged due to photoemission process, evidenced by the measured Si2p binding energy of 104.4 eV. Application of a +10 V bias attracts the low energy neutralizing electrons, stemming from a hot filament, and leads to a negatively charged oxide layer, also evidenced by the measured Si2p binding energy of 102.9 eV. The single polyelectrolyte overlayer also responds to this polarity change of the oxide layer underneath by displaying a somewhat larger shifts both in the C1s and N1s peaks. In addition to the shifts in the positions, the N1s peaks undergo a significant intensity depletion, mostly on the positively charged -N + component. We interpret this intensity depletion to be the result of reorientation of some of the dangling positively charged groups by moving toward the negatively charged oxide underlayer. To our knowledge this is the first time that a chemically specific response to an electrical stimuli is reported using XPS. A bilayer LbL film consisting of PAH and PSS, exhibits even a larger charging shift, but this time no intensity alteration is observed, most probably due to locking of the -N + groups by the -SO 3 + counterions of the second layer.

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Section: Resultsmentioning

confidence: 96%

Response of Polyelectrolyte Layers to the SiO₂ Substrate Charging As Probed by XPS

Conger

Süzer

2009

Langmuir

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“…The number-average molecular weight of PSSA was found to be 22.5 kg N mol -1 based on intrinsic viscosity measurements using the appropriate Mark-Houwink-Sakurada equation 38) . PSSZn was prepared by neutralizing PSSA with zinc acetate 37) . The synthesis of poly(1-vinylimidazole) (PVI) was reported previously 28) .…”

Section: Experimental Partmentioning

confidence: 99%

“…We have recently investigated the interactions between polymers containing pyridine or piperidine groups and proton-donating polymers or ionomers by X-ray photoelectron spectroscopy (XPS) [30][31][32][33][34][35][36][37] . When the chemical environment of an atom in a polymer blend is perturbed due to specific interactions, the development of a new peak can be observed in the XPS spectrum.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic studies of interactions in complexes of poly(1-vinylimidazole) with poly(styrenesulfonic acid) or the zinc salt of poly(styrenesulfonate)

Luo¹,

Goh²,

Lee³

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: Poly(1-vinylimidazole) (PVI) forms complexes with poly(styrenesulfonic acid) and the zinc salt of poly(styrenesulfonate) (PSSA and PSSZn, respectively) in water/ethanol (2 : 1 v/v) solution, indicating the presence of strong interactions. Infrared spectroscopic measurements showed the existence of protonated imidazole groups in all the complexes. X-ray photoelectron spectroscopic studies showed the development of high-binding-energy N(1) 1s and N(3) 1s peaks, but the values of the binding energy shift of N(3) 1s are larger than those of N(1) 1s in all PVI/PSSA and PVI/PSSZn complexes, suggesting proton transfer from PSSA to imidazole N(3) atoms in the PVI/PSSA complexes, and coordination between Zn 2+ and the imidazole N(3) atoms in the PVI/PSSZn complexes. Based on the values of the binding energy shift of the interacting nitrogen atoms, the strength of the coordination interaction in PVI/PSSZn complexes is weaker than the ionic interactions in the PVI/PSSA complexes. The development of a new S 2p spin-orbit split doublet at a low-binding-energy region reveals the existence of interactions between Zn 2+ and the imidazole nitrogen atoms.

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“…S-2 in the ESM) of the sub-micro columns were characterized by Zn 2P 3/2 and Zn 2P 1/2 peaks, with the positions of the peaks at 1023.2 eV and 1046.4 eV suggesting that the products contained Zn 2+ ions [20]. Meanwhile, the N 1s peak appeared as a single feature at 399.05 eV, which is indicative of the presence of only one type of TCNQ [11, 21,22].…”

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confidence: 99%

Water-controlled synthesis of low-dimensional molecular crystals and the fabrication of a new water and moisture indicator

Dong

Liu

et al. 2009

Nano Res.

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Arrays of low-dimensional molecular crystals of square columns (1-D) and nanolamellae (2-D) of Zn[TCNQ] 2 (H 2 O) 2 with large areas (up to 10 20 cm 2 ) have been synthesized by controlled addition of water to Zn and TCNQ. Based on the ability to accurately control the reaction, a new moisture and water indicator has been developed. The simple method, the large areas of material prepared, the fine size tuning, and the typical semiconductor behavior of the resulting low-dimensional molecular materials promise applications in molecular electronics as well as nanoelectronics. The system is an effective indicator for the detection of traces of water and moisture.

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X-ray Photoelectron Spectroscopic Studies of Interactions between Poly(4-vinylpyridine) and Poly(styrenesulfonate) Salts

Cited by 48 publications

References 30 publications

Response of Polyelectrolyte Layers to the SiO₂ Substrate Charging As Probed by XPS

Response of Polyelectrolyte Layers to the SiO₂ Substrate Charging As Probed by XPS

Spectroscopic studies of interactions in complexes of poly(1-vinylimidazole) with poly(styrenesulfonic acid) or the zinc salt of poly(styrenesulfonate)

Water-controlled synthesis of low-dimensional molecular crystals and the fabrication of a new water and moisture indicator

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X-ray Photoelectron Spectroscopic Studies of Interactions between Poly(4-vinylpyridine) and Poly(styrenesulfonate) Salts

Cited by 48 publications

References 30 publications

Response of Polyelectrolyte Layers to the SiO2 Substrate Charging As Probed by XPS

Response of Polyelectrolyte Layers to the SiO2 Substrate Charging As Probed by XPS

Spectroscopic studies of interactions in complexes of poly(1-vinylimidazole) with poly(styrenesulfonic acid) or the zinc salt of poly(styrenesulfonate)

Water-controlled synthesis of low-dimensional molecular crystals and the fabrication of a new water and moisture indicator

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Response of Polyelectrolyte Layers to the SiO₂ Substrate Charging As Probed by XPS

Response of Polyelectrolyte Layers to the SiO₂ Substrate Charging As Probed by XPS