Organic and aqueous dispersible tetrapods for biosensing applications

Sadawana, Mayur; Katiyar, Arpit; Ramachandran, Roshni; Bellare, Jayesh; Srivastava, Rohit

doi:10.1109/icsens.2013.6688204

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…[58] Additionally, CdSe nanotetrapods can be used for biosensing if its arms can be functionalized with different proteins. [59] With this background, we have investigated the interaction of MPA-capped CdSe nanotetrapods with human serum albumin (HSA), with a focus on the possibility of displacement of bound ligands like warfarin [36,60,61] from HSA by its interaction with these nanocrystals.…”

Section: Introductionmentioning

confidence: 99%

Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods

et al. 2020

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Water soluble CdSe nanotetrapods are prepared by ligand exchange from organic‐soluble ones. In order to achieve this, oleic acid, which is the capping agent for as prepared water‐insoluble nanotetrapods, is exchanged with mercaptopropanoic acid (MPA). Shape and size of nanotetrapods are conserved upon ligand exchange. Ground state bleach recovery dynamics remain the same as well. However, they are completely non‐emissive. These water‐soluble nanotetrapods disrupt the secondary structure of Human Serum Albumin (HSA) and consequently, release warfarin bound to the protein.

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Section: Introductionmentioning

confidence: 99%

Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods

et al. 2020

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“…Chiral nanotetrapods (Tps) with four arms uniformly distributed in the space are examples of such understudied material systems. The unique 3D structure of Tps makes them promising for diverse applications that are not easy to achieve with spherical nanodots and nanorods. − For example, each arm of CdSe Tps functionalized with a different proteins could be effective in multianalyte biosensing . With Tps, electron transport could be achieved perpendicularly to the plane of a device .…”

Section: Introductionmentioning

confidence: 99%

“…19−21 For example, each arm of CdSe Tps functionalized with a different proteins could be effective in multianalyte biosensing. 22 With Tps, electron transport could be achieved perpendicularly to the plane of a device. 23 The arms of Tps could be wired out to fabricate a single NC transistor, and the intracrystal charge-transfer characteristic could improve the efficiency of solar cells and enhance the photocatalytic activity.…”

Section: ■ Introductionmentioning

confidence: 99%

Chiral 3D CdSe Nanotetrapods

Shao

Jiang

et al. 2020

Inorg. Chem.

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Three-dimensional (3D) nanomaterials have been intensively investigated because of their unique properties and wide range of potential applications; however, the ligand-induced chirality in 3D semiconductor nanocrystals has been scarcely studied. In this paper, we report the synthesis of hydrophobic 3D CdSe nanotetrapods (Tps) with a high degree of uniformity in their morphology by using the hot-injection method. The core and arms of Tps are distinct in their crystal structure, thus creating an intracrystal heterojunction. The size of Tps, primarily the length of four arms, is controlled by changing the amount of didecyldimethylammonium bromide and reaction time. Next, enantiopure cysteine ligands were introduced to replace the hydrophobic native stabilizers to prepare chiral l- and d-cysteine-capped CdSe Tps. Importantly, the circular dichroism (CD) line shapes of l/d-cysteine-capped CdSe Tps are assigned to the different excitonic transitions of the core and arms, respectively. In addition, the observed CD activities are found to be sensitive to the size of the CdSe Tps, where the anisotropic g factors have increased and reached the maximum value at a moderate aspect ratio (AR) and a further increase of the AR leads to a decrease of the g factor. Because of charge transfer between the core and arms, we propose a plausible mechanism potentially responsible for the induced CD line shapes in terms of the excitonic states of Tps with two different crystal structures. We believe that chiral 3D nanomaterials with anisotropic morphologies could offer new opportunities for relevant applications.

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Temperature dependent excited state dynamics in dual emissive CdSe nano-tetrapods

Banerjee

Gupta

Srivastava

et al. 2018

Phys. Chem. Chem. Phys.

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Time resolved spectroscopic investigation has been performed on nano-tetrapods, which are exotic nanocrystals with zinc blende type core structure and four arms with wurtzite structure. Dual emission is observed in these nanostructures. A band-edge emission occurs at 500-600 nm and a broad surface state emission occurs in the 600-900 nm region. The band-edge emission decays almost completely in a few ps, indicating the operation of an efficient trapping process. Incomplete recovery kinetics of ground state bleach from transient absorption experiments signifies the existence of a long-lived excited state. The lifetime of the surface state emission is in tens of nanoseconds. At liquid nitrogen temperature, surface state emission is enhanced to a greater degree than band edge emission, indicating suppression of various deactivation pathways at this temperature. Thus, an idea of excited state dynamics of these systems is developed, with a view of future tuning of photoluminescence properties by playing with the different radiative and nonradiative pathways involved.

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Organic and aqueous dispersible tetrapods for biosensing applications

Cited by 3 publications

References 9 publications

Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods

Release of Warfarin from Human Serum Albumin by Water‐soluble CdSe Nanotetrapods

Chiral 3D CdSe Nanotetrapods

Temperature dependent excited state dynamics in dual emissive CdSe nano-tetrapods

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