Work

Plasmonic Coupling within Atomically Precise Nanocluster Dimers for Engineering Hot-Carrier Generation and Molecular Activation

Year: 2026

Type: article

Abstract: Activating the exceptionally strong N≡N bond remains a fundamental challenge due to the chemical inertness of molecular nitrogen (N2). Plasmonic nanoclusters offer a promising approach by generating localized electromagnetic fields and energetic hot carriers that can drive bond activation under ambient conditions. Here, we combine real-time time-dependent density functional theory with Ehrenfest molecular dynamics to reveal how plasmonic coupling between tetrahedral Ag20 nanoclusters governs N2 activation and dissociation. Systematic variation of the intercluster separation shows that a 6 Å nanogap maximizes near-field enhancement and hot-electron transfer to the adsorbed N2, accompanied by N–N activation. Consequently, N2 dissociation is achieved at incident field strengths as low as 0.5 V Å–1, whereas larger-gap dimers exhibit substantially lower activity. Similarly, isolated N2 remains intact under comparable conditions. These findings establish nanogap engineering as an effective strategy for optimizing plasmon-driven N2 activation and provide design principles for developing efficient plasmonic catalysts.

Source: Nano Letters

DOI: 10.1021/acs.nanolett.6c03672

Authors: Khushboo Bhardwaj, Samir Kumar Nayak, Pramod K. Verma, Sharma S. R. K. C. Yamijala

Institution: Indian Institute of Technology Madras

Language: English

Topic: Nanocluster Synthesis and Applications

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: green

Funders: Arthritis National Research Foundation, National Research Foundation, University Grants Commission, Indian Institute of Technology Madras

Awards: G1620325716, G3856652615, G3958768800