1
|
Kołodziej G, Szostak S, Tomczyk E, Wójcik M. Tuneable Plasmonic Resonances Of A Dynamic Thin Film Of Ultrasmall Nanocrystals Modified In the Anti-Galvanic Reduction Process. Chemistry 2023; 29:e202301843. [PMID: 37642228 DOI: 10.1002/chem.202301843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 08/27/2023] [Accepted: 08/27/2023] [Indexed: 08/31/2023]
Abstract
Ultrasmall gold nanoparticles (NPs) have revolutionized nanotechnology as they are an excellent starting substrate for the synthesis of organic-inorganic hybrid materials with photonic or energy conversion applications, often with a responsive nature. However, ultrasmall NPs do not sustain plasmonic resonances, preventing their use in plasmon-related applications. In the presented work, we show a method of chemical modification of ultrasmall gold nanoparticles in order to fabricate dynamically controlled plasmonic thin films. For this purpose, we used the Anti-Galvanic Reduction process (AGR) to modify the surface of small gold nanoparticles, inducing plasmonic properties without notable size increases. Au@Ag NPs are then modified with liquid crystal-like organic ligands. The obtained NPs can assemble into densely packed films with long-range order and temperature-dependent structural properties. Namely, we detect two, fully reversible phase transitions between the hexagonal and cubic symmetries. The combination of AGR and organic surface modifications enabled us to demonstrate the possibility of managing plasmonic properties in the thin film of ~2 nm diameter metallic NPs.
Collapse
Affiliation(s)
- Grzegorz Kołodziej
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
| | - Szymon Szostak
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
| | - Ewelina Tomczyk
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
| | - Michał Wójcik
- Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093, Warsaw, Poland
| |
Collapse
|
2
|
Shi K, Na N, Ouyang J. Label- and enzyme-free plasmon-enhanced single molecule fluorescence detection of HIV DNA fragments based on a catalytic hairpin assembly. Analyst 2022; 147:604-613. [PMID: 35103721 DOI: 10.1039/d1an02195h] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We developed a label- and enzyme-free single molecule fluorescence counting strategy for HIV DNA fragments detection. The nucleic acid biosensor consists of a 5' terminal connected with a triangular gold nanoplate, 3' terminal rich in guanine hairpin probe (HP1) and a hairpin probe HP2 complementary to the partial sequence of HP1. Without the existence of the target DNA, the DNA fragment rich in the guanine region is locked in a hairpin structure and cannot form a G-quadruplex, hence NMM exhibits a low fluorescence signal. When the target DNA exists, the hairpin assembly will trigger a strand displacement amplification reaction that produces a great number of G-quadruplexes, and the fluorescence brightness of NMM will be enhanced. The plasmon resonance effect of the triangular gold nanoplates will further amplify the fluorescence signal. This method can analyze the target DNA with high sensitivity and selectivity, and the detection limit is 0.83 fM. The analysis of the HIV DNA fragments in diluted human serum samples was successfully achieved, and the recovery rate was 92%-104%. Because of its easy operation and low cost, it has broad development potential in biochemical analysis and clinical applications.
Collapse
Affiliation(s)
- Ke Shi
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China.
| | - Na Na
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China.
| | - Jin Ouyang
- Key Laboratory of Theoretical and Computational Photochemistry, Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P.R. China.
| |
Collapse
|
3
|
Li Z, Tran DK, Nguyen M, Jian T, Yan F, Jenekhe SA, Chen CL. Amphiphilic Peptoid-Directed Assembly of Oligoanilines into Highly Crystalline Conducting Nanotubes. Macromol Rapid Commun 2022; 43:e2100639. [PMID: 35038198 DOI: 10.1002/marc.202100639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/29/2021] [Indexed: 12/13/2022]
Abstract
It is reported herein the synthesis of a novel amphiphilic diblock peptoid bearing a terminal conjugated oligoaniline and its self-assembly into small-diameter (D ≈ 35 nm) crystalline nanotubes with high aspect ratios (>30). It is shown that both tetraaniline (TANI)-peptoid and bianiline (BANI)-peptoid triblock molecules self-assemble in solution to form rugged highly crystalline nanotubes that are very stable to protonic acid doping and de-doping processes. The similarity of the crystalline tubular structure of the nanotube assemblies revealed by electron microscopy imaging, and X-ray diffraction analysis of the nanotube assemblies of TANI-functionalized peptoids and nonfunctionalized peptoids showed that the peptoid is an efficient ordered structure directing motif for conjugated oligomers. Films of doped TANI-peptoid nanotubes has a dc conductivity of ca. 95 mS cm-1 , while the thin films of doped un-assembled TANI-peptoids show a factor of 5.6 lower conductivity, demonstrating impact of the favorable crystalline ordering of the assemblies on electrical transport. These results demonstrate that peptoid-directed supramolecular assembly of tethered π-conjugated oligo(aniline) exemplify a novel general strategy for creating rugged ordered and complex nanostructures that have useful electronic and optoelectronic properties.
Collapse
Affiliation(s)
- Zhiliang Li
- Physical Sciences Division, Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Duyen K Tran
- Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA
| | - Mary Nguyen
- Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA
| | - Tengyue Jian
- Physical Sciences Division, Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - Feng Yan
- Physical Sciences Division, Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA.,School of Chemistry & Chemical Engineering, Linyi University, Linyi, Shandong Province, 276005, China
| | - Samson A Jenekhe
- Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA
| | - Chun-Long Chen
- Physical Sciences Division, Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99352, USA.,Department of Chemical Engineering and Department of Chemistry, University of Washington, Seattle, WA, 98195-1750, USA
| |
Collapse
|
4
|
Qindeel M, Sargazi S, Hosseinikhah SM, Rahdar A, Barani M, Thakur VK, Pandey S, Mirsafaei R. Porphyrin‐Based Nanostructures for Cancer Theranostics: Chemistry, Fundamentals and Recent Advances. ChemistrySelect 2021. [DOI: 10.1002/slct.202103418] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Maimoona Qindeel
- Hamdard Institute of Pharmaceutical Sciences Hamdard University Islamabad Campus Islamabad Pakistan
- Department of Pharmacy Quaid-i-Azam University Islamabad Pakistan
| | - Saman Sargazi
- Cellular and Molecular Research Center Research Institute of Cellular and Molecular Sciences in Infectious Diseases Zahedan University of Medical Sciences Zahedan 9816743463 Iran
| | - Seyedeh Maryam Hosseinikhah
- Nanotechnology Research Center Pharmaceutical Technology Institute Mashhad University of Medical Sciences Mashhad Iran
| | - Abbas Rahdar
- Department of Physics Faculty of Science University of Zabol Zabol Iran
| | - Mahmood Barani
- Medical Mycology and Bacteriology Research Center Kerman University of Medical Sciences Kerman 7616913555 Iran
| | - Vijay Kumar Thakur
- Biorefining and Advanced Materials Research Centre Scotland's Rural College Scotland Edinburgh EH9 3JG United Kingdom
- School of Engineering University of Petroleum & Energy Studies (UPES) Dehradun 248007 Uttarakhand India
| | - Sadanand Pandey
- Particulate Matter Research Center Research Institute of Industrial Science & Technology (RIST) 187-12, Geumho-ro Gwangyang-si Jeollanam-do 57801, Republic of Korea
| | - Razieh Mirsafaei
- Novel Drug Delivery Systems Research Centre and Department of Pharmaceutics School of Pharmacy Isfahan University of Medical Sciences Isfahan Iran
| |
Collapse
|
5
|
Gao Y, Wang J, Wang W, Zhao T, Cui Y, Liu P, Xu S, Luo X. More Symmetrical “Hot Spots” Ensure Stronger Plasmon-Enhanced Fluorescence: From Au Nanorods to Nanostars. Anal Chem 2021; 93:2480-2489. [DOI: 10.1021/acs.analchem.0c04518] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yuhuan Gao
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Jun Wang
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Weina Wang
- Qingdao Special Servicemen Recuperation Center of PLA Navy, Qingdao 266000, P. R. China
| | - Tingting Zhao
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Yanyun Cui
- College of Chemistry and Materials Engineering, Beijing Technology and Business University, Beijing 100048, P. R. China
| | - Pingping Liu
- Zhengzhou Tobacco Research Institute, CNTC, Zhengzhou 450000, P. R. China
| | - Shenghao Xu
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| | - Xiliang Luo
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China
| |
Collapse
|
6
|
Zheng P, Kang J, Paria D, Kang JU, Barman I. Molecular Radiative Energy Shifts under Strong Oscillating Fields. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2007244. [PMID: 33354911 PMCID: PMC8099018 DOI: 10.1002/smll.202007244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Indexed: 06/12/2023]
Abstract
Coherent manipulation of light-matter interactions is pivotal to the advancement of nanophotonics. Conventionally, the non-resonant optical Stark effect is harnessed for band engineering by intense laser pumping. However, this method is hindered by the transient Stark shifts and the high-energy laser pumping which, by itself, is precluded as a nanoscale optical source due to light diffraction. As an analog of photons in a laser, surface plasmons are uniquely positioned to coherently interact with matter through near-field coupling, thereby, providing a potential source of electric fields. Herein, the first demonstration of plasmonic Stark effect is reported and attributed to a newly uncovered energy-bending mechanism. As a complementary approach to the optical Stark effect, it is envisioned that the plasmonic Stark effect will advance fundamental understanding of coherent light-matter interactions and will also provide new opportunities for advanced optoelectronic tools, such as ultrafast all-optical switches and biological nanoprobes at lower light power levels.
Collapse
Affiliation(s)
- Peng Zheng
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, United States
| | - Jeeun Kang
- Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins Medical Institutions, Baltimore, MD, 21231, United States
| | - Debadrita Paria
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, United States
| | - Jin U. Kang
- Department of Electrical and Computer Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, MD, 21218, United States
| | - Ishan Barman
- Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD 21218, United States
- Department of Oncology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, United States
- The Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University School of Medicine, Baltimore, MD 21287, United States
| |
Collapse
|
7
|
Tian J, Huang B, Nawaz MH, Zhang W. Recent advances of multi-dimensional porphyrin-based functional materials in photodynamic therapy. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213410] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
8
|
Spitaleri L, Gangemi CMA, Purrello R, Nicotra G, Trusso Sfrazzetto G, Casella G, Casarin M, Gulino A. Covalently Conjugated Gold-Porphyrin Nanostructures. NANOMATERIALS 2020; 10:nano10091644. [PMID: 32825720 PMCID: PMC7558707 DOI: 10.3390/nano10091644] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 08/14/2020] [Accepted: 08/18/2020] [Indexed: 12/23/2022]
Abstract
Gold nanoparticles show important electronic and optical properties, owing to their size, shape, and electronic structures. Indeed, gold nanoparticles containing no more than 30–40 atoms are only luminescent, while nanometer-sized gold nanoparticles only show surface plasmon resonance. Therefore, it appears that gold nanoparticles can alternatively be luminescent or plasmonic and this represents a severe restriction for their use as optical material. The aim of our study was the fabrication of nanoscale assembly of Au nanoparticles with bi-functional porphyrin molecules that work as bridges between different gold nanoparticles. This functional architecture not only exhibits a strong surface plasmon, due to the Au nanoparticles, but also a strong luminescence signal due to porphyrin molecules, thus, behaving as an artificial organized plasmonic and fluorescent network. Mutual Au nanoparticles–porphyrin interactions tune the Au network size whose dimension can easily be read out, being the position of the surface plasmon resonance strongly indicative of this size. The present system can be used for all the applications requiring plasmonic and luminescent emitters.
Collapse
Affiliation(s)
- Luca Spitaleri
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (L.S.); (C.M.A.G.); (R.P.)
- National Interuniversity Consortium of Materials Science and Technology (I.N.S.T.M., Research Unit (UdR) of Catania, Viale Andrea Doria 6, 95125 Catania, Italy
| | - Chiara M. A. Gangemi
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (L.S.); (C.M.A.G.); (R.P.)
| | - Roberto Purrello
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (L.S.); (C.M.A.G.); (R.P.)
- National Interuniversity Consortium of Materials Science and Technology (I.N.S.T.M., Research Unit (UdR) of Catania, Viale Andrea Doria 6, 95125 Catania, Italy
| | - Giuseppe Nicotra
- National Research Council—Institute for Microelectronics and Microsystems (CNR-IMM), Strada VIII, 5, 95121 Catania, Italy;
| | - Giuseppe Trusso Sfrazzetto
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (L.S.); (C.M.A.G.); (R.P.)
- National Interuniversity Consortium of Materials Science and Technology (I.N.S.T.M., Research Unit (UdR) of Catania, Viale Andrea Doria 6, 95125 Catania, Italy
- Correspondence: (G.T.S.); (A.G.); Tel.: +39-095-7385067 (A.G.); Fax: +39-095-580138 (A.G.)
| | - Girolamo Casella
- Department of Earth and Sea Sciences, University of Palermo, Via Archirafi 22, 90123 Palermo, Italy;
| | - Maurizio Casarin
- Department of Chemical Sciences, University of Padova, Via Francesco Marzolo 1, 35131 Padova, Italy;
| | - Antonino Gulino
- Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125 Catania, Italy; (L.S.); (C.M.A.G.); (R.P.)
- National Interuniversity Consortium of Materials Science and Technology (I.N.S.T.M., Research Unit (UdR) of Catania, Viale Andrea Doria 6, 95125 Catania, Italy
- Correspondence: (G.T.S.); (A.G.); Tel.: +39-095-7385067 (A.G.); Fax: +39-095-580138 (A.G.)
| |
Collapse
|
9
|
Im SW, Ha H, Yang W, Jang JH, Kang B, Seo DH, Seo J, Nam KT. Light polarization dependency existing in the biological photosystem and possible implications for artificial antenna systems. PHOTOSYNTHESIS RESEARCH 2020; 143:205-220. [PMID: 31643017 DOI: 10.1007/s11120-019-00682-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
The processes of biological photosynthesis provide inspiration and valuable lessons for artificial energy collection, transfer, and conversion systems. The extraordinary efficiency of each sequential process of light to biomass conversion originates from the unique architecture and mechanism of photosynthetic proteins. Near 100% quantum efficiency of energy transfer in biological photosystems is achieved by the chlorophyll assemblies in antenna complexes, which also exhibit a significant degree of light polarization. The three-dimensional chiral assembly of chlorophylls is an optimized biological architecture that enables maximum energy transfer efficiency with precisely designed coupling between chlorophylls. In this review, we summarize the key lessons from the photosynthetic processes in biological photosystems, and move our focus to energy transfer mechanisms and the chiral structure of the chlorophyll assembly. Then, we introduce recent approaches and possible implications to realize the biological energy transfer processes on bioinspired scaffold-based artificial antenna systems.
Collapse
Affiliation(s)
- Sang Won Im
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Heonjin Ha
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Woojin Yang
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea
| | - Jun Ho Jang
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Boyeong Kang
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea
| | - Da Hye Seo
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea
| | - Jiwon Seo
- Department of Chemistry, School of Physics and Chemistry, Gwangju Institute of Science and Technology, Gwangju, 61005, South Korea.
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 08826, South Korea.
| |
Collapse
|
10
|
Du B, Tang C, Zhao D, Zhang H, Yu D, Yu M, Balram KC, Gersen H, Yang B, Cao W, Gu C, Besenbacher F, Li J, Sun Y. Diameter-optimized high-order waveguide nanorods for fluorescence enhancement applied in ultrasensitive bioassays. NANOSCALE 2019; 11:14322-14329. [PMID: 31323078 DOI: 10.1039/c9nr02330e] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Development of fluorescence enhancement (FE) platforms based on ZnO nanorods (NRs) has sparked considerable interest, thanks to their well-demonstrated potential in chemical and biological detection. Among the multiple factors determining the FE performance, high-order waveguide modes are specifically promising in boosting the sensitivity and realizing selective detection. However, quantitative experimental studies on the influence of the NR diameter, substrate, and surrounding medium, on the waveguide-based FE properties remain lacking. In this work, we have designed and fabricated a FE platform based on patterned and well-defined arrays of vertical, hexagonal prism ZnO NRs with six distinct diameters. Both direct experimental evidence and theoretical simulations demonstrate that high-order waveguide modes play a crucial role in FE, and are strongly dependent on the NR diameter, substrate, and surrounding medium. Using the optimized FE platform, a significant limit of detection (LOD) of 10-16 mol L-1 for Rhodamine-6G probe detection is achieved. Especially, a LOD as low as 10-14 g mL-1 is demonstrated for a prototype biomarker of carcinoembryonic antigen, which is improved by one order compared with the best LOD ever reported using fluorescence-based detection. This work provides an efficient path to design waveguiding NRs-based biochips for ultrasensitive and highly-selective biosensing.
Collapse
Affiliation(s)
- Baosheng Du
- Condensed Matter Science and Technology Institute, School of Instrumentation Science and Engineering, Harbin Institute of Technology, Harbin 150080, China.
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Culf AS. Peptoids as tools and sensors. Biopolymers 2019; 110:e23285. [PMID: 31070792 DOI: 10.1002/bip.23285] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Revised: 04/09/2019] [Accepted: 04/15/2019] [Indexed: 12/19/2022]
Abstract
A review of molecular tools and sensors assembled on N-substituted glycine, or α-peptoid, oligomers between 2013 and November 2018 with the following sections: (a) Peptoids as crystal growth modifiers, (b) Peptoids as catalysts, (c) Ion and molecule sequestration and transport, (d) Peptoid sensors, (e) Macromolecule recognition, (f) Cellular transporters, (g) Medical imaging, (h) Future direction and (i) Summary and outlook. Peptoids are a promising class of peptide mimic making them an excellent platform for functional molecule preparation. Attributes of peptoid oligomers include: (a) the ease of precise sequence definition and mono-dispersity; (b) access to a vast chemical space within simple and repeating chemical preparative steps and (c) thermal, chemical and biological stability all lending support for their application in a number of areas, with some that have been realised to date. The peptoid tool and sensor examples selected have realised practical utility. They serve to illustrate the rapidity of new insight that can generate in many disparate areas of science and technology, enabling the quick assembly of design criteria for efficient peptoid molecular tools and sensors.
Collapse
Affiliation(s)
- Adrian S Culf
- Sussex Research Laboratories, Inc., Ottawa, Ontario, Canada
| |
Collapse
|
12
|
Francisco AP, Botequim D, Prazeres DMF, Serra VV, Costa SMB, Laia CAT, Paulo PMR. Extreme Enhancement of Single-Molecule Fluorescence from Porphyrins Induced by Gold Nanodimer Antennas. J Phys Chem Lett 2019; 10:1542-1549. [PMID: 30862164 DOI: 10.1021/acs.jpclett.9b00373] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Porphyrins are typically weak emitters, which presents challenges to their optical detection by single-molecule fluorescence microscopy. In this contribution, we explore the enhancement effect of gold nanodimer antennas on the fluorescence of porphyrins in order to enable their single-molecule optical detection. Four meso-substituted free-base porphyrins were evaluated: two cationic, one neutral, and one anionic porphyrin. The gold nanodimer antennas are able to enhance the emission from these porphyrins by a factor of 105-106 increase in the maximum detected photon rates. This extreme enhancement is due to the combination of an antenna effect on the excitation rate that is estimated to be above 104-fold and an emission efficiency that corresponds to an increase of 2-10 times in the porphyrin's fluorescence quantum yield.
Collapse
Affiliation(s)
- Alexandra P Francisco
- LAQV@REQUIMTE, Chemistry Department, Faculty of Science and Technology , Universidade NOVA de Lisboa , 2829-516 Caparica , Portugal
| | | | | | | | | | - César A T Laia
- LAQV@REQUIMTE, Chemistry Department, Faculty of Science and Technology , Universidade NOVA de Lisboa , 2829-516 Caparica , Portugal
| | | |
Collapse
|