Was funded by Mackenzie Analysis Fund (MackPesquisa, ProjectNo. 181009). Supported by the National Council for Scientific and Technological Development (CNPq), Acknowledgments: The authors would prefer to thank Universidad de Monterrey, Mexico, the Centro the Coordination for the Improvement of Larger EducationMinas Gerais, Belo Horizonte, Brazil, and also the Centro de Microscopia da Universidade Federal de Personnel–Brazil (CAPES), plus the Universidad de de Desenvolvimento da Tecnologia Nuclear–CDTN, Belo Horizonte, Brazil National Council for Monterrey.Scientific and Technological applicable. Institutional Review Board Statement: NotDevelopment (CNPq), and Coordination for the Improvement of Higher Education Personnel–Brazil (CAPES). Informed Consent Statement: Not applicable. Conflicts of Interest: The authors declare no conflict of interest or financial intention. Information Availability Statement: Not applicable.nanomaterialsArticleDistance-Dependent Fluorescence Resonance Energy Transfer Enhancement on Nanoporous GoldLianmin Cui 1,two, , Ling Zhang 1, , and Heping Zeng three,2School of Optical-Electrical and Pc Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China; [email protected] Public Experiment Center, University of Shanghai for Science and Technologies, Shanghai 200093, China Key Laboratory for Ultrafine Supplies of Ministry of Education, School of Supplies Science and Engineering, East China University of Science and Technologies, Shanghai 200237, China; [email protected] Chongqing Important Laboratory of Precision Optics, Chongqing Institute of East China Standard University, Chongqing 401120, China Correspondence: [email protected]; Tel.: 86-183-0192-5823 These authors (S)-Equol site|(S)-Equol} Estrogen Receptor/ERR|(S)-Equol} Protocol|(S)-Equol} References|(S)-Equol} custom synthesis|(S)-Equol} Cancer} contributed equally to this work.Abstract: Fluorescence resonance energy transfers (FRET) in between cyan fluorescent protein (CFP) and yellow fluorescent protein (YFP) on nanoporous gold (NPG) are systematically investigated by controlling the distance between NPG and fluorescent 5-Hydroxymethyl-2-furancarboxylic acid Biological Activity proteins with polyelectrolyte multilayers. The FRET among CFP and YFP is significantly enhanced by NPG, and also the maximum enhancement is associated to both ligament size of NPG along with the distance involving NPG and proteins. With the optimized distance, 18-fold FRET enhancement was obtained on NPG in comparison to that on glass, as well as the conversion efficiency is about 90 . The possible to tune the characteristic energy transfer distance has implications for applications in nanophotonic devices and delivers a attainable strategy to design sensors and light energy converters.Citation: Cui, L.; Zhang, L.; Zeng, H. Distance-Dependent Fluorescence Resonance Power Transfer Enhancement on Nanoporous Gold. Nanomaterials 2021, 11, 2927. https:// doi.org/10.3390/nano11112927 Academic Editor: Andrey B. Evlyukhin Received: 28 September 2021 Accepted: 29 October 2021 Published: 1 NovemberKeywords: FRET; plasmon; nanoporous gold; fluorescence enhancement; protein1. Introduction Fluorescence resonance power transfer (FRET) can be a non-radiative energy transfer process based on dipole interaction , and it has attracted a great attention as a consequence of its application in detecting low concentrated analytes in chemical and biological systems . However, the limitation from the signal amplification of acceptor from donor and comparatively low energy conversion efficiency affect the application of FRET in ultra-sensitive detection . Plasmonic enhancement which resulting from longer range non-radiative energ.