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Kaja S, Nag A. Ag-Au-Cu Trimetallic Alloy Microflower: A Highly Sensitive SERS Substrate for Detection of Low Raman Scattering Cross-Section Thiols. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:16562-16573. [PMID: 37943256 DOI: 10.1021/acs.langmuir.3c02528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2023]
Abstract
Trimetallic Ag-Au-Cu alloy microflowers (MFs) with various surface compositions were synthesized on a glass coverslip and used as efficient surface-enhanced Raman spectroscopy (SERS) substrates for highly sensitive label-free detection of smaller Raman scattering cross-section molecules, namely, L-cysteine and toxic thiophenols. MFs of different compositions were synthesized via appropriate mixing of metal-alkyl ammonium halide precursors followed by a single-step thermolysis at 350 °C. While the Ag percentage was kept constant at 90% for all the substrates, the composition of Au and Cu was varied between 1 and 9% sequentially. The synthesized MFs were thoroughly characterized by using field emission scanning electron microscopy (FE-SEM), wide-angle X-ray scattering, X-ray photoelectron spectroscopy (XPS), and X-ray fluorescence techniques. FE-SEM studies revealed that the MFs were present throughout the substrate, and the average size varied from 20 to 40 μm. XPS studies showed that the top surface of the alloy substrates was rich in either Au or Cu atoms, while Ag remained underneath. The performance of the trimetallic MFs as SERS substrates was evaluated using Rhodamine 6G as a probe molecule, which showed that the MFs with Ag-Au-Cu compositions 90-7-3 and 90-3-7 were found to be the best and of equal SERS efficiency. The SERS enhancement factor (EF) of both these MFs was found to be the same, approximately 9 × 107, when calculated using 1,2,3-benzatriazole as the probe molecule. Between the two, the trimetallic substrate with a higher Au percentage (Ag-Au-Cu as 90-7-3) was used for the sensitive SERS-based detection of thiols to exploit the strong Au-S binding interaction. By virtue of the high EF of the substrate, the inherently low Raman scattering cross-sections of the probe molecules were greatly enhanced in SERS mode. The 'limit of quantification (LOQ)' values were found to be 1 nM for aliphatic L-Cysteine and 1-0.1 pM for aromatic thiols using the trimetallic SERS sensor.
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Affiliation(s)
- Sravani Kaja
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India
| | - Amit Nag
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India
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Kaja S, Nag A. Bimetallic Ag-Cu Alloy Microflowers as SERS Substrates with Single-Molecule Detection Limit. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:13027-13037. [PMID: 34699226 DOI: 10.1021/acs.langmuir.1c02119] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Bimetallic Ag-Cu alloy microflowers with tunable surface compositions were fabricated as surface-enhanced Raman spectroscopy (SERS) substrates with a limit of detection in the zeptomolar range for the analyte molecule rhodamine 6G (R6G). The substrates were prepared on a glass coverslip through a bottom-up strategy by simple thermolysis of metal-alkyl ammonium halide precursors. The reaction temperature and composition of the alloy were varied sequentially to find out the maximum SERS efficiency from the substrates. While UV-vis spectroscopy was employed to characterize the optical properties of the substrates, the bulk and surface compositions of the microflowers were determined using energy-dispersive X-ray fluorescence (ED-XRF) and X-ray photoelectron spectroscopy (XPS) techniques, respectively. Also, the structural and morphological characterizations of the substrates were performed by X-ray diffraction and scanning electron microscope (SEM), respectively. For alloys, the ED-XRF studies confirmed that the bulk compositions matched with the feed ratio, while the surface compositions were found to be rich in copper in the form of both elementary copper and copper oxide, as revealed by XPS studies. From the efficiency studies for different compositions prepared, it was found that 10% Ag-Cu alloy microflowers produced the maximum SERS intensity for resonant R6G molecules as probes. In fact, R6G evidences a 50-fold enhancement in SERS spectra with 10% alloy microflowers as against pure Ag microflowers. Using 1, 2, 3-benzotriazole as a nonresonant Raman probe, uniform enhancement factors on the order of ≈108 were achieved from different parts of the 10% Ag-Cu alloy microflower. The same substrate showed excellent Raman response for detecting R6G at very low concentrations such as 10 zM, leading to detection and analysis of SERS spectra from a single R6G molecule.
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Affiliation(s)
- Sravani Kaja
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India
| | - Amit Nag
- Department of Chemistry, Birla Institute of Technology and Science (BITS) Pilani, Hyderabad Campus, Jawahar Nagar, Kapra Mandal, Hyderabad 500078, India
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Ţălu Ş, Matos RS, Pinto EP, Rezaee S, Mardani M. Stereometric and fractal analysis of sputtered Ag-Cu thin films. SURFACES AND INTERFACES 2020. [DOI: 10.1016/j.surfin.2020.100650] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Freire RM, Rojas-Nunez J, Elias-Arriaga AL, Fujisawa K, Troncoso L, Denardin JC, Baltazar SE. Natural arrangement of AgCu bimetallic nanostructures through oleylamine reduction. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00940g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The use of AgCu bimetallic NPs as a catalyst is highly desired. To accomplish this, the morphology of nanostructures is a key factor.
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Affiliation(s)
- R. M. Freire
- Institute of Applied Chemical Sciences
- Universidad Autónoma de Chile
- Santiago 8910060
- Chile
| | - J. Rojas-Nunez
- Departamento de Física and CEDENNA
- Universidad de Santiago de Chile
- USACH
- Santiago
- Chile
| | - A. L. Elias-Arriaga
- Department of Physics and Center for 2-Dimensional and Layered Materials
- The Pennsylvania State University
- University Park
- USA
| | - K. Fujisawa
- Department of Physics and Center for 2-Dimensional and Layered Materials
- The Pennsylvania State University
- University Park
- USA
| | - L. Troncoso
- Instituto de Materiales y Procesos Termomecánicos
- Universidad Austral de Chile
- Valdivia
- Chile
| | - J. C. Denardin
- Departamento de Física and CEDENNA
- Universidad de Santiago de Chile
- USACH
- Santiago
- Chile
| | - S. E. Baltazar
- Departamento de Física and CEDENNA
- Universidad de Santiago de Chile
- USACH
- Santiago
- Chile
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Yang L, Chen L, Chen YC, Kang L, Yu J, Wang Y, Lu C, Mashimo T, Yoshiasa A, Lin CH. Homogeneously alloyed nanoparticles of immiscible Ag–Cu with ultrahigh antibacterial activity. Colloids Surf B Biointerfaces 2019; 180:466-472. [DOI: 10.1016/j.colsurfb.2019.05.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 05/07/2019] [Accepted: 05/08/2019] [Indexed: 11/26/2022]
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Rout L, Kumar A, Chand PK, Achary LSK, Dash P. Microwave‐Assisted Efficient One‐Pot Multi‐Component Synthesis of Octahydroquinazolinone Derivatives Catalyzed by Cu@Ag Core‐Shell Nanoparticle. ChemistrySelect 2019. [DOI: 10.1002/slct.201900619] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lipeeka Rout
- Department of ChemistryNational Institute of Technology, Rourkela, Odisha India, 769008
- Department of Polymer Science and EngineeringPusan National University, Busan 46241 Republic of Korea
| | - Aniket Kumar
- Department of ChemistryNational Institute of Technology, Rourkela, Odisha India, 769008
- School of Materials Science and EngineeringChonnam National University, Gwang-Ju Republic of Korea
| | - Pradyumna K Chand
- Department of ChemistryNational Institute of Technology, Rourkela, Odisha India, 769008
| | - L Satish K Achary
- Department of ChemistryNational Institute of Technology, Rourkela, Odisha India, 769008
| | - Priyabrat Dash
- Department of ChemistryNational Institute of Technology, Rourkela, Odisha India, 769008
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Ghosh S, Molla RA, Kayal U, Bhaumik A, Islam SM. Ag NPs decorated on a COF in the presence of DBU as an efficient catalytic system for the synthesis of tetramic acids via CO2 fixation into propargylic amines at atmospheric pressure. Dalton Trans 2019; 48:4657-4666. [DOI: 10.1039/c9dt00017h] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Ag NPs are decorated at the surface of a COF material TpPa-1 and the resulting Ag@TpPa-1 catalyzes efficiently for the synthesis of tetramic acids from a variety of propargylic amines using CO2 as reagent.
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Affiliation(s)
| | | | - Utpal Kayal
- School of Materials Science
- Indian Association for the Cultivation of Science
- India
| | - Asim Bhaumik
- School of Materials Science
- Indian Association for the Cultivation of Science
- India
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Thanh TD, Chuong ND, Hien HV, Kim NH, Lee JH. CuAg@Ag Core-Shell Nanostructure Encapsulated by N-Doped Graphene as a High-Performance Catalyst for Oxygen Reduction Reaction. ACS APPLIED MATERIALS & INTERFACES 2018; 10:4672-4681. [PMID: 29336546 DOI: 10.1021/acsami.7b16294] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Development of a robust, cost-effective, and efficient catalyst is extremely necessary for oxygen reduction reaction (ORR) in fuel cell applications. Herein, we reported a well-defined nanostructured catalyst of highly dispersed CuAg@Ag core-shell nanoparticle (NP)-encapsulated nitrogen-doped graphene nanosheets (CuAg@Ag/N-GNS) exhibiting a superior catalytic activity toward ORR in alkaline medium. The synergistic effects produced from the unique properties of CuAg@Ag core-shell NPs and N-GNS made such a novel nanohybrid display a catalytic behavior comparable to that of the commercial Pt/C product. In particular, it demonstrated a much better stability and methanol tolerance than Pt/C under the same conditions. Because of its outstanding electrochemical performance and ease of synthesis, CuAg@Ag/N-GNS material was expected to be a promising low-cost catalyst for ORR in alkaline fuel cell applications.
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Affiliation(s)
- Tran Duy Thanh
- Advanced Materials Institute of BIN Convergence Technology (BK21 Plus Global), Department of BIN Convergence Technology, and ‡Carbon Composite Research Centre, Department of Polymer & Nanoscience and Technology, Chonbuk National University , Jeonju, Jeonbuk 54896, Republic of Korea
| | - Nguyen Dinh Chuong
- Advanced Materials Institute of BIN Convergence Technology (BK21 Plus Global), Department of BIN Convergence Technology, and ‡Carbon Composite Research Centre, Department of Polymer & Nanoscience and Technology, Chonbuk National University , Jeonju, Jeonbuk 54896, Republic of Korea
| | - Hoa Van Hien
- Advanced Materials Institute of BIN Convergence Technology (BK21 Plus Global), Department of BIN Convergence Technology, and ‡Carbon Composite Research Centre, Department of Polymer & Nanoscience and Technology, Chonbuk National University , Jeonju, Jeonbuk 54896, Republic of Korea
| | - Nam Hoon Kim
- Advanced Materials Institute of BIN Convergence Technology (BK21 Plus Global), Department of BIN Convergence Technology, and ‡Carbon Composite Research Centre, Department of Polymer & Nanoscience and Technology, Chonbuk National University , Jeonju, Jeonbuk 54896, Republic of Korea
| | - Joong Hee Lee
- Advanced Materials Institute of BIN Convergence Technology (BK21 Plus Global), Department of BIN Convergence Technology, and ‡Carbon Composite Research Centre, Department of Polymer & Nanoscience and Technology, Chonbuk National University , Jeonju, Jeonbuk 54896, Republic of Korea
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