Valency Control and Functional Synergy in DNA‐Bonded Nanomolecules

Song, Lei; Deng, Zhaoxiang

doi:10.1002/cnma.201700222

Cited by 19 publications

(16 citation statements)

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“…[35][36][37] However, a strong capacitive coupling or direct charge transfer is oen prohibited in these assemblies by the bulky DNA strands. 38,39 To circumvent this problem, dried samples (unexpected due to structural disruption) are oen used, as capillary forces generated during water evaporation can bring NPs in close contact. [40][41][42] Apart from self-assembly, direct synthesis of interfaced plasmonic nanodimers is possible but producing gapped structures is hard.…”

Section: Introductionmentioning

confidence: 99%

Chemically modified nanofoci unifying plasmonics and catalysis

et al. 2019

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Section: Introductionmentioning

confidence: 99%

Chemically modified nanofoci unifying plasmonics and catalysis

et al. 2019

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“…Larger, superparamagnetic and superferromagnetic nanoparticles (NPs) behave in many ways like atoms of paramagnetic and ferromagnetic metals, respectively 4 , 5 . Various ways of encoding “valency” in spherical NPs have been proposed 6 and utilized for constructing “colloidal molecules” 7 . NPs can also be assembled into onedimensional structures in a process similar to the polymerization of small molecules 8 ; indeed, the ability to visualize NPs by electron microscopy has been utilized to validate theoretical models developed for molecular polymerization.…”

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Electrostatic co-assembly of nanoparticles with oppositely charged small molecules into static and dynamic superstructures

et al. 2021

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Coulombic interactions can be used to assemble charged nanoparticles into higher-order structures, but the process requires oppositely charged partners that are similarly sized. The ability to mediate the assembly of such charged nanoparticles using structurally simple small molecules would greatly facilitate the fabrication of nanostructured materials and harnessing their applications in catalysis, sensing, and photonics. Here we show that small molecules having as few as three electric charges can effectively induce attractive interactions between oppositely charged nanoparticles in water. These interactions can guide the assembly of charged nanoparticles into colloidal crystals of a quality previously only thought to result from their cocrystallization with oppositely charged nanoparticles of a similar size. Transient nanoparticle assemblies can be generated using positively charged nanoparticles and multiply charged anions that are enzymatically hydrolyzed into mono- and/or dianions. Our findings demonstrate an approach for the facile fabrication, manipulation, and further investigation of static and dynamic nanostructured materials in aqueous environments.

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“…上述"干态"结构也不适合化学和生物溶液体系的应用. 自组装是制备纳米二聚结构的常用方法 [2,[25][26][27][28][29] , 但组装结构难以发生粒子间电荷转移 [30][31][32] . 最近, Deng 等 [33][34][35] 结合自组装与限域热(或激光)烧结, 制备出不同导电结宽度的二聚结构.…”

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Tunable Charge Transfer Plasmon at Gold/Copper Heterointerface

Zhu¹,

Song²,

Deng³

2020

Acta Chim. Sinica

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Metal nanostructures with localized surface plasmon resonance (LSPR) have attracted great attention in catalysis, sensing, nanooptics, and nanomedicine. Charge transfer plasmon (CTP) is a LSPR mode that strongly depends on a conductive junction between metallic nanounits. Benefitting from the charge transfer junction, CTP provides a facile way to generate widely tunable LSPR with highly localized/enhanced light magnetic field and photothermal effect. The limited availability of highly tunable CTP structures and their fabrication techniques hinders a further pursuit of their functions and applications. In response to this situation, the present work aims at developing a simple while highly efficient synthetic route to width-adjustable Au/Cu heterojunctions capable of evoking tunable CTP behaviors. The strategy relies on a non-specific surface adsorption of low-cost, naturally occurred fish sperm DNA on a gold nanoseed to control heterogeneous copper nucleation. Such a process offers a chance to tailor the contact area between the gold and copper nano-domains in the bimetallic structure. Highly tunable CTP resonance from visible to near-infrared region is then realizable on the basis of this method. Experimental and calculated extinction spectra consistently reveal three key variables for the CTP structure, including the width of conductive junction and the sizes of gold and copper particles. These parameters are associated with DNA coverage, copper precursor concentration, and the synthetic conditions for gold nanoparticles, which allow for a CTP tuning from visible to near infrared wavelengths. By fully exploiting these highly controllable parameters, the maximally achievable CTP wavelength readily enters a near infrared II domain. The resulting CTP signals have a red-shift of up to 750 nm relative to the 530～570 nm LSPR peaks of individual gold and copper nanoparticles, corresponding to a very narrow Au/Cu conductive contact of 11～13 nm in width. The role of nonspecific DNA adsorption in the above process proves unique (currently irreplaceable) compared to other molecular adsorbates. The easily tunable Au/Cu heterointerface paves a way to integrated CTP and catalytic/sensing functions in future research.

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Valency Control and Functional Synergy in DNA‐Bonded Nanomolecules

Cited by 19 publications

References 135 publications

Chemically modified nanofoci unifying plasmonics and catalysis

Chemically modified nanofoci unifying plasmonics and catalysis

Electrostatic co-assembly of nanoparticles with oppositely charged small molecules into static and dynamic superstructures

Tunable Charge Transfer Plasmon at Gold/Copper Heterointerface

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