Tailoring the optical properties of poly(diallyl dimethyl ammonium chloride) polyelectrolyte by incorporation of 2-mercaptoethanol capped CdSe nanoparticles

Tyagi, Chetna; Sharma, Ambika

doi:10.1088/0022-3727/49/40/405301

Cited by 3 publications

(2 citation statements)

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“…However, band gaps are highly dependent on the surface functional group distribution and synthesis method of MXene, making it difficult to compare . Additionally, PDADMA has a direct band gap of 4 eV, which likely contributes to the higher band gap of the (PDADMA/MXene) 10 multilayers as compared to the pure MXene films prepared using VAF …”

Section: Results and Discussionmentioning

confidence: 99%

“…11 Additionally, PDADMA has a direct band gap of 4 eV, which likely contributes to the higher band gap of the (PDADMA/ MXene) 10 multilayers as compared to the pure MXene films prepared using VAF. 48 Oxidative Stability of the Multilayers. MXenes are notably prone to oxidation, which leads to changes in both color and electrical properties.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Electronic and Optical Property Control of Polycation/MXene Layer-by-Layer Assemblies with Chemically Diverse MXenes

Echols

Yun

et al. 2021

Langmuir

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MXenes, 2D nanomaterials derived from ceramic MAX phases, have drawn considerable interest in a wide variety of fields including energy storage, catalysis, and sensing. There are many possible MXene compositions due to the chemical and structural diversity of parent MAX phases, which can bear different possible metal atoms “M”, number of layers, and carbon or nitrogen “X” constituents. Despite the potential variety in MXene types, the bulk of MXene research focuses upon the first MXene discovered, Ti3C2T. With the recent discovery of polymer/MXene multilayer assemblies as thin films and coatings, there is a need to broaden the accessible types of multilayers by including MXenes other than Ti3C2T z ; however, it is not clear how altering the MXene type influences the resulting multilayer growth and properties. Here, we report on the first use of MXenes other than Ti3C2T z , specifically Ti2CT z and Nb2CT z , for the layer-by-layer (LbL) assembly of polycation/MXene multilayers. By comparing these MXenes, we evaluate both how changing M (Ti vs Nb) and “n” (Ti3C2T zvs Ti2CT z ) affect the growth and properties of the resulting multilayer. Specifically, the aqueous LbL assembly of each MXene with poly(diallyldimethylammonium) into films and coatings is examined. Further, we compare the oxidative stability, optoelectronic properties (refractive index, absorption coefficient, optical conductivity, and direct and indirect optical band gaps), and the radio frequency heating response of each multilayer. We observe that MXene multilayers with higher “n” are more electrically conductive and oxidatively stable. We also demonstrate that Nb2CT z containing films have lower optical band gaps and refractive indices at the cost of lower electrical conductivities as compared to their Ti2CT z counterparts. Our work demonstrates that the properties of MXene/polycation multilayers are highly dependent on the choice of constituent MXene and that the MXene type can be altered to suit specific applications.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%