Effect of amine and thiol addition on the surface chemistry and agglomeration of fine Cu powders

Unwin, Peter J.; Rusnacik, Martina E.; Kresta, Suzanne M.; Nelson, Alan E.

doi:10.1016/j.colsurfa.2008.04.036

Cited by 9 publications

(3 citation statements)

References 14 publications

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“…The thiol treated ZnO nanoparticles are relatively uniformly distributed throughout the P3HT over the entire area. This phenomenon arises because thiol modification tends to promote compatibility between the ZnO surface and P3HT, preventing the formation of aggregates within the polymer matrix. , The large threshold voltage shift observed in Figure , thus, is attributed in part to the large interface area between P3HT and thiol-ZnO, assuming the surface morphology is representative of the buried P3HT/ZnO interfaces.…”

Section: Resultsmentioning

confidence: 95%

Exciton Dissociation and Charge Transport Properties at a Modified Donor/Acceptor Interface: Poly(3-hexylthiophene)/Thiol-ZnO Bulk Heterojunction Interfaces

et al. 2012

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Engineering the electron donor/acceptor interface provides not only flexibility in designing optoelectronic devices but also new opportunities to optimize device performance. However, significant challenges arise from the difficulty of examining the interface, which is buried in a composite film. In this paper, we probed exciton dissociation at a poly(3-hexylthiophene) (P3HT)/ZnO bulk heterojunction interface treated with thiol molecules and charge-transport properties in P3HT of the composite film using field effect transistor (FET) devices. The role of thiol modification of ZnO in charge transfer and charge transport within the bulk heterojunction interface was addressed through comparison of the threshold voltage and the FET mobility between P3HT/thiol-ZnO and P3HT/ZnO FETs. Attachment of thiol molecules onto the ZnO surface induced a larger photoinduced threshold voltage shift than that for an FET with pristine ZnO, indicating that more excitons were dissociated within the P3HT/ZnO composite film. The origin of this effect is discussed through the relationship between the increased interfacial area between P3HT and thiol-ZnO, inferred from surface morphology, and structural ordering of P3HT at the interface. The charge carrier transport properties of P3HT in the composite film are separated from charge transfer, and found to depend on the presence of thiol, offering information on carrier scattering/trapping at the interface. The integrated information of charge transfer and charge transport properties probed with an FET device would benefit efforts aimed at the optimization of solar cell devices.

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Section: Resultsmentioning

confidence: 95%

Exciton Dissociation and Charge Transport Properties at a Modified Donor/Acceptor Interface: Poly(3-hexylthiophene)/Thiol-ZnO Bulk Heterojunction Interfaces

et al. 2012

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“…It has been reported that the modes of interaction between MOs and DTT can proceed via a surface catalytic pathway, reduction of the dissolved metal ion and the oxidation of the thiol (HSR) group to the corresponding disulde (RS-SR), or electron transfer leading to the formation of a stable ligand between the metal ion and oxidized DTT. 31,32,[39][40][41][42][43] In this study, it is suggested that the two reactivity patterns follow a surface catalytic Fentonlike pathway with higher activity MO surfaces forming ordered chemisorbed layers of fully oxidized DTT (RS-SR) while the ones with lower reactivity leading to the partially oxidized form (RS-SH) of DTT.…”

Section: Ir and Nmr Spectramentioning

confidence: 83%

“…The IR spectra of Pb 3 O 4and ZnO-DTT show only one thiol n(S-H) at 2564 cm À1 and one broad n(C-S) peak at 738 cm À1 (Fig. 31,32,[39][40][41][42][43] In this study, it is suggested that the two reactivity patterns follow a surface catalytic Fentonlike pathway with higher activity MO surfaces forming ordered chemisorbed layers of fully oxidized DTT (RS-SR) while the ones with lower reactivity leading to the partially oxidized form (RS-SH) of DTT. This indicates either the Fig.…”

Section: Ir and Nmr Spectramentioning

confidence: 99%

Redox activity and chemical interactions of metal oxide nano- and micro-particles with dithiothreitol (DTT)

Nicolas

Jaafar

Sepetdjian

et al. 2015

Environ. Sci.: Processes Impacts

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The wide application and production of nanotechnology have increased the interest in studying the toxicity of nano- and micro-sized particles escaping into air from various aspects of the production process. Metal oxides (MOs) are one particular class of particles that exist abundantly in ambient PM. Studies show an emphasis on biological mechanisms by which inhalation exposure to MOs leads to disease. However, different biological assays provide different redox activity rankings making it difficult to assess the contributions of various MOs to measures of aggregate toxicity in multi-pollutant systems such as ambient PM. Therefore, research to evaluate the chemical interaction between these particles and molecules that are relevant to cellular redox activity can help in establishing indicators of reactivity. In particular, this study assesses the redox activity of six MOs mainly emitted from anthropogenic industrial activities using the dithiothreitol (DTT) assay. DTT is commonly used in acellular assays due to its analogous structure to cellular glutathione. The structural and chemical behaviors between active MOs and DTT were elucidated using FTIR, NMR, and BET methods. The results indicate that the health risk (redox activity) associated with MOs is mainly a function of their surface reactivity demonstrated by the ability of the oxidized (S-H) bond in DTT to form a stable bond with the MO surface.

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1,10-Phenanthroline as an accelerator for Ag nanoparticle-catalysed electroless copper deposition

Liu

Chou

et al. 2014

Applied Surface Science

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Effect of amine and thiol addition on the surface chemistry and agglomeration of fine Cu powders

Cited by 9 publications

References 14 publications

Exciton Dissociation and Charge Transport Properties at a Modified Donor/Acceptor Interface: Poly(3-hexylthiophene)/Thiol-ZnO Bulk Heterojunction Interfaces

Exciton Dissociation and Charge Transport Properties at a Modified Donor/Acceptor Interface: Poly(3-hexylthiophene)/Thiol-ZnO Bulk Heterojunction Interfaces

Redox activity and chemical interactions of metal oxide nano- and micro-particles with dithiothreitol (DTT)

1,10-Phenanthroline as an accelerator for Ag nanoparticle-catalysed electroless copper deposition

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