Tunable Nanoantennas for Surface Enhanced Infrared Absorption Spectroscopy by Colloidal Lithography and Post-Fabrication Etching

Chen, Kai; Dao, Thang Duy; Nagao, Tadaaki

doi:10.1038/srep44069

Cited by 37 publications

(25 citation statements)

References 42 publications

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“… 4 − 7 Besides their extensive applications at visible and near-infrared frequencies, engineered nanoplasmonic structures deliver unique possibilities for biomolecular studies with ultrasensitive surface-enhanced infrared absorption spectroscopy based on the distinct molecular vibrations in the mid-infrared (mid-IR) range. 8 − 12 The mid-IR vibrational signatures of molecules correspond to chemical bonds among their constituent elements and therefore enable nondestructive and label-free characterization. By providing orders of magnitude signal enhancement of these chemical fingerprints, engineered metallic nanostructures represent promising systems for sensitive detection of biomolecules and provide the means to overcome the limitations of conventional infrared absorption spectroscopy.…”

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confidence: 99%

Real-Time In Situ Secondary Structure Analysis of Protein Monolayer with Mid-Infrared Plasmonic Nanoantennas

et al. 2018

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Dynamic detection of protein conformational changes at physiological conditions on a minute amount of samples is immensely important for understanding the structural determinants of protein function in health and disease and to develop assays and diagnostics for protein misfolding and protein aggregation diseases. Herein, we experimentally demonstrate the capabilities of a mid-infrared plasmonic biosensor for real-time and in situ protein secondary structure analysis in aqueous environment at nanoscale. We present label-free ultrasensitive dynamic monitoring of β-sheet to disordered conformational transitions in a monolayer of the disease-related α-synuclein protein under varying stimulus conditions. Our experiments show that the extracted secondary structure signals from plasmonically enhanced amide I signatures in the protein monolayer can be reliably and reproducibly acquired with second derivative analysis for dynamic monitoring. Furthermore, by using a polymer layer we show that our nanoplasmonic approach of extracting the frequency components of vibrational signatures matches with the results attained from gold-standard infrared transmission measurements. By facilitating conformational analysis on small quantities of immobilized proteins in response to external stimuli such as drugs, our plasmonic biosensor could be used to introduce platforms for screening small molecule modulators of protein misfolding and aggregation.

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confidence: 99%

Real-Time In Situ Secondary Structure Analysis of Protein Monolayer with Mid-Infrared Plasmonic Nanoantennas

et al. 2018

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“…Biosensors derived from nanomaterials have excellent potential for clinical diagnosis and monitoring of cancer . Among the various nanobiosensor types, plasmonic or SPR‐based biosensors offer real time detection of cancer biomarkers due to their many outstanding characteristics such as cost‐efficiency, high sensitivity, label‐free detection, and excellent accuracy . Au and Ag NPs have been explored for SPR‐based tumor recognition due to their high SPR amplitude and other desirable properties (e.g., single molecule detection capability, chemical inertness, biocompatibility, affinity toward specific functional groups, for example, amines/thiols) .…”

Section: Nanomaterial‐based Cancer Sensing Systemsmentioning

confidence: 99%

Advanced Functional Structure‐Based Sensing and Imaging Strategies for Cancer Detection: Possibilities, Opportunities, Challenges, and Prospects

Kumar

Kukkar

Hashemi

et al. 2019

Adv Funct Materials

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Cancer is the second most common cause of death in the world. The principal limitations thus far encountered in the clinical practice of probing cancer are diverse and include low sensitivity, time consumption, bulkiness, and cost. In this respect, nanomaterial (NM)-based sensing techniques are recognized as a superior alternative to efficiently resolve such limitations. A better understanding of NM-based sensing platforms is thus important so that these novel avenues can easily be explored for clinical applications. These platforms have the merits of high sensitivity, high specificity, rapid response, and easy-to-read signals. This review offers a comprehensive survey of NM-based advanced cancer-sensing techniques and will help the scientific community establish optimum sensing strategies based on an accurate assessment of the interactions between cancer biomarkers and NM-based platforms.but are not limited to, carcinoma, sarcoma, leukemia, lymphoma, non-Hodgkin lymphoma, myeloma, central nervous system cancer, lung and bronchus cancer, colon cancer, rectum cancer, prostate cancer, bladder cancer, kidney and renal pelvis cancer, endometrial cancer, pancreatic cancer, liver cancer, and thyroid cancers. [1] Moreover, the most commonly occurring cancers tend to differ by common criteria like sex and age. For example, men are at risk for prostate, lung, and colorectal cancer, women are at risk for breast, lung and colorectal cancer, and children are at risk for leukemia, brain tumors, and lymphoma. The severity of the cancer depends upon the development level or staging of the disease. [2] Likewise, the type of treatment required to treat the cancer is determined by the staging of the disease.The more severe condition of cancer is metastasis, i.e., the uncontrolled growth of cells that invade surrounding tissues. The metastasis condition of cancer can affect any organ of the body. [3] As per the WHO 2010 report on cancer, the lives of 30% patients could have been saved if the cancer was diagnosed earlier. The detection of cancer is not easy because the immune system does not necessarily consider cancerous cells as foreign bodies. However, a few changes (such as altered biomarker levels and the presence of cancerous cells in biological fluids) can be detected. [4] In general, cancer biomarkers are overexpressed proteins present in blood/serum and at the cancer cell surface. The accurate and efficient detection of these biomarkers can be useful for cancer detection. The major problem with biomarkers is their low level in the body during the earlier stages of cancer. Hence, an efficient sensor/device capable of detecting these molecules even at very low levels, if developed, could help the clinician efficiently diagnose cancer cells in the human body.The sensing techniques presently used by clinicians suffer from several limitations; specifically, they are time consuming, bulky, have low sensitivity, and are expensive. Nanomaterial (NM)-based techniques have become an important alternative to the laborious conventional...

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“…With the continuous advancement in nano-lithographic technology, different fabrication techniques have been employed. These include electron beam lithography (EBL), focused ion beam (FIB) milling, nano-imprint lithography (NIL) [ 34 ], and colloidal lithography [ 94 ].…”

Section: Device Fabricationmentioning

confidence: 99%

Nano-Antenna Coupled Infrared Detector Design

Mubarak

Sidek

Abdel‐Rahman

et al. 2018

Sensors

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Since the 1940s, infrared (IR) detection and imaging at wavelengths in the two atmospheric windows of 3 to 5 and 8 to 14 μm has been extensively researched. Through several generations, these detectors have undergone considerable developments and have found use in various applications in different fields including military, space science, medicine and engineering. For the most recently proposed generation, these detectors are required to achieve high-speed detection with spectral and polarization selectivity while operating at room temperature. Antenna coupled IR detectors appear to be the most promising candidate to achieve these requirements and has received substantial attention from research in recent years. This paper sets out to present a review of the antenna coupled IR detector family, to explore the main concepts behind the detectors as well as outline their critical and challenging design considerations. In this context, the design of both elements, the antenna and the sensor, will be presented individually followed by the challenging techniques in the impedance matching between both elements. Some hands-on fabrication techniques will then be explored. Finally, a discussion on the coupled IR detector is presented with the aim of providing some useful insights into promising future work.

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Tunable Nanoantennas for Surface Enhanced Infrared Absorption Spectroscopy by Colloidal Lithography and Post-Fabrication Etching

Cited by 37 publications

References 42 publications

Real-Time In Situ Secondary Structure Analysis of Protein Monolayer with Mid-Infrared Plasmonic Nanoantennas

Real-Time In Situ Secondary Structure Analysis of Protein Monolayer with Mid-Infrared Plasmonic Nanoantennas

Advanced Functional Structure‐Based Sensing and Imaging Strategies for Cancer Detection: Possibilities, Opportunities, Challenges, and Prospects

Nano-Antenna Coupled Infrared Detector Design

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