Combined Imaging and Chemical Sensing with a Disposable Microscope Objective Chemical Sensor

Hartzell, Kathryn A.; Danowski, Kristine L.; Pantano, Paul

doi:10.1080/05704920701645852

Cited by 5 publications

(5 citation statements)

References 65 publications

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“…Aromatic organic molecules and mixed inorganic-organic hybrid coordination polymers are promising luminescent materials for their potential applications, such as lightemitting materials (LEDs), chemical sensors, photochemistry, and electroluminescent (EL) displays [23,[39][40][41]. The luminescences of 1 and 2 as well as the free ligand L were investigated at room temperature (see Fig.…”

Section: Luminescent Propertiesmentioning

confidence: 99%

Cobalt(II) complexes of a pyridyl/benzimidazol-1-yl-based ligand: syntheses, crystal structures, and photoluminescent properties

Liu

Guo

et al. 2009

Transition Met Chem

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Two new cobalt(II) coordination polymers with a pyridyl/benzimidazol-1-yl-based ligand, namely 1-(4-pyridylmethyl)-1H-benzimidazole (L), were synthesized and characterized structurally by single crystal X-ray diffraction as [Co(L) 2 (SCN) 2 ] ? (1) and [Co(L) 2 (N 3 ) 2 ] ? (2). Complex 1 has a three-dimensional twofold interpenetrating diamondoid network, while 2 possesses a one-dimensional chain structure, which is further interlinked into a higher-dimensional supramolecular framework by hydrogen-bonding interactions. The structural differences between complexes 1 and 2 are attributable to the different auxiliary ligands, SCN -for 1 and N 3 -for 2. The luminescent properties of the complexes and the free ligand have been investigated.

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Section: Luminescent Propertiesmentioning

confidence: 99%

Cobalt(II) complexes of a pyridyl/benzimidazol-1-yl-based ligand: syntheses, crystal structures, and photoluminescent properties

Liu

Guo

et al. 2009

Transition Met Chem

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“…Meanwhile, a continuing challenge in microscopy techniques involves overcoming the limitation that the sample must be brought to the microscope stage. 12,13 , Several methods for solving this problem have been proposed by researchers. 14,,–16 However, either the instrument was too expensive or the obtained images of analytes were not clear.…”

Section: Introductionmentioning

confidence: 99%

An Optical Fiber Sensor for Remote pH Sensing and Imaging

Wang

2012

Appl Spectrosc

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A fiber-optical probe for pH sensing and real-time imaging is successfully fabricated by connecting a polymer imaging fiber and a gradient index (GRIN) lens rod which was modified with a sensing film. By employing an improved metallographic microscope, an optical system is designed to cooperate with the probe. This novel technique has high-quality imaging capabilities for observing remote samples while measuring pH. The linear range of the probe is pH 1.2-3.5. This technique overcomes the difficulty that high-quality images cannot be obtained when directly using conventional imaging bundles for pH sensing and imaging. As preliminary applications, the corrosion behavior of an iron screw and the reaction process of rust were investigated in buffer solutions of pH 2.0 and 2.9, respectively. The experiment demonstrated that the pH values of the analytes' surface were higher than that of buffer solutions due to the chemical reaction. It provides great potential for applications in optical multifunctional detection, especially in chemical sensing and biosensing.

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“…For example, the luminescence of many ruthenium complexes is strongly quenched by molecular oxygen, and the Stern−Volmer equation describes the relationship between the oxygen concentration and the luminescence intensity or lifetime of the complex. This is the basis for very versatile oxygen sensors that have seen a wide range of applications. − …”

mentioning

confidence: 99%

“…This is the basis for very versatile oxygen sensors that have seen a wide range of applications. [3][4][5][6][7] Quantification of pH is another important area. We have described the application of [Ru(4,7-diphenyl-1,10-phenanthroline) 2 (4,4′-dicarboxy-2,2′-bipyridine)] 2+ ([Ru(Ph 2 phen) 2 (DCbpy)] 2+ ), in pH sensors.…”

mentioning

confidence: 99%

Determining Proton Diffusion in Polymer Films by Lifetimes of Luminescent Complexes Measured in the Frequency Domain

Bowyer

Demas

2008

Anal. Chem.

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Polymer-supported luminescent metal complexes represent an important class of oxygen, pH, and ion sensors. The diffusion properties of the analyte into the sensing film are important for rational sensor and support design and development. We describe a technique using lifetime measurements in the frequency domain for determining the diffusion coefficient of hydrochloric acid through various polymeric pH sensor films. Two types of polymers are doped with [Ru(4,7-diphenyl-1,10-phenanthroline)2(4,4'-dicarboxy-2,2'-bipyridine)]Cl2. We monitor the phase shift of luminescence (from which we calculate the apparent lifetime, tau(app)) versus time after applying a step increase in the aqueous HCl concentration at the surfaces of the film. We model the decrease in tau(app) as a function of time using the diffusion coefficient of HCl in the polymer as the only adjustable parameter. The model accurately predicts the lifetime versus time curves, and the resulting diffusion coefficients are highly dependent on the polymer. Relative to bulk water, diffusion of protons within very hydrophilic hydrated D4 polymer (a polyethylene oxide cross-linked siloxane ring polymer) films is hindered approximately 4-fold, while within a more hydrophobic sol gel it is hindered by over 1 order of magnitude. The methodology is adaptable for measuring diffusion coefficients of a variety of analytes in different sensor films as long as the bound and unbound forms luminescence and the excited states have different lifetimes.

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Combined Imaging and Chemical Sensing with a Disposable Microscope Objective Chemical Sensor

Cited by 5 publications

References 65 publications

Cobalt(II) complexes of a pyridyl/benzimidazol-1-yl-based ligand: syntheses, crystal structures, and photoluminescent properties

Cobalt(II) complexes of a pyridyl/benzimidazol-1-yl-based ligand: syntheses, crystal structures, and photoluminescent properties

An Optical Fiber Sensor for Remote pH Sensing and Imaging

Determining Proton Diffusion in Polymer Films by Lifetimes of Luminescent Complexes Measured in the Frequency Domain

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