scholarly journals Graphene Paper-Gold Nanostructured Electrodes Obtained by Laser Dewetting for High Sensitive Non-Enzymatic Glucose Sensing

Proceedings ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 1
Author(s):  
Antonino Scandurra ◽  
Francesco Ruffino ◽  
Maria Grazia Grimaldi
Keyword(s):  
Laser Annealing ◽  
Yttrium Aluminum Garnet ◽  
Glucose Sensing ◽  
Actual State ◽  
Nanosecond Laser ◽  
Glucose Detection ◽  
Yttrium Aluminum ◽  
Nanostructured Gold ◽  
Graphene Paper ◽  
532 Nm

Electrodes for non-enzymatic glucose sensing based on gold nanostructures onto graphene paper (GP-AuNPs) have been obtained inducing dewetting, by laser annealing, of 8 nm-thick Au layer deposited by sputtering. Molten-phase dewetting of gold layer, which produces the formation of spherical nanoparticles (AuNPs), was achieved by nanosecond laser annealing using a pulsed (12 ns) Nd: yttrium aluminum garnet YAG laser operating at 532 nm. The Surface of the electrode presents gold rich regions consisting of graphene nanoplatelets covered by spherical AuNPs. The sizes of AuNPs are in the range of 10–150 nm. Glucose was detected at a potential of 0.17 V vs SCE, which corresponds to the intense peak of two electrons oxidation. Highest sensitivity of 600 µA mM−1 cm−2 of glucose detection was obtained. The resulting sensitivity, detection limit and linear range of glucose detection are very promising since comparable to the actual state of art results for nanostructured gold electrodes which are, however, produced by complex multi-steps processes.

scholarly journals Dewetted Gold Nanostructures onto Exfoliated Graphene Paper as High Efficient Glucose Sensor

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1794
Author(s):  
Antonino Scandurra ◽  
Francesco Ruffino ◽  
Maria Censabella ◽  
Antonio Terrasi ◽  
Maria Grazia Grimaldi
Keyword(s):  
Laser Annealing ◽  
Glucose Sensor ◽  
Saturated Calomel Electrode ◽  
Glucose Sensing ◽  
Gold Nanostructures ◽  
Actual State ◽  
Nanosecond Laser ◽  
Rutherford Back Scattering ◽  
High Efficient ◽  
Graphene Paper

Non-enzymatic electrochemical glucose sensing was obtained by gold nanostructures on graphene paper, produced by laser or thermal dewetting of 1.6 and 8 nm-thick Au layers, respectively. Nanosecond laser annealing produces spherical nanoparticles (AuNPs) through the molten-phase dewetting of the gold layer and simultaneous exfoliation of the graphene paper. The resulting composite electrodes were characterized by X-ray photoelectron spectroscopy, cyclic voltammetry, scanning electron microscopy, micro Raman spectroscopy and Rutherford back-scattering spectrometry. Laser dewetted electrode presents graphene nanoplatelets covered by spherical AuNPs. The sizes of AuNPs are in the range of 10–150 nm. A chemical shift in the XPS Au4f core-level of 0.25–0.3 eV suggests the occurrence of AuNPs oxidation, which are characterized by high stability under the electrochemical test. Thermal dewetting leads to electrodes characterized by faceted not oxidized gold structures. Glucose was detected in alkali media at potential of 0.15–0.17 V vs. saturated calomel electrode (SCE), in the concentration range of 2.5μM−30 mM, exploiting the peak corresponding to the oxidation of two electrons. Sensitivity of 1240 µA mM−1 cm−2, detection limit of 2.5 μM and quantifications limit of 20 μM were obtained with 8 nm gold equivalent thickness. The analytical performances are very promising and comparable to the actual state of art concerning gold based electrodes.

Picosecond 532-nm neodymium-doped yttrium aluminum garnet laser—a promising modality for the management of verrucous epidermal nevi

2018 ◽  
Vol 33 (3) ◽  
pp. 597-601 ◽  
Author(s):  
Assi Levi ◽  
Dan Ben Amitai ◽  
Daniel Mimouni ◽  
Yael A. Leshem ◽  
Ofir Arzi ◽  
...  
Keyword(s):  
Yttrium Aluminum Garnet ◽  
Yttrium Aluminum Garnet Laser ◽  
Yttrium Aluminum ◽  
532 Nm

scholarly journals In Vitro Laser Ablation of Natural Marine Biofilms

2004 ◽  
Vol 70 (11) ◽  
pp. 6905-6908 ◽  
Author(s):  
Kanavillil Nandakumar ◽  
Hideki Obika ◽  
Akihiro Utsumi ◽  
Toshihiko Ooie ◽  
Tetsuo Yano
Keyword(s):  
Laser Irradiation ◽  
Yttrium Aluminum Garnet ◽  
Power Laser ◽  
Yttrium Aluminum Garnet Laser ◽  
Marine Biofilm ◽  
Marine Biofilms ◽  
Yttrium Aluminum ◽  
532 Nm ◽  
Natural Biofilms

ABSTRACT We studied the efficiency of pulsed low-power laser irradiation of 532 nm from an Nd:YAG (neodymium-doped yttrium-aluminum-garnet) laser to remove marine biofilm developed on titanium and glass coupons. Natural biofilms with thicknesses of 79.4 � 27.8 μm (titanium) and 107.4 � 28.5 μm (glass) were completely disrupted by 30 s of laser irradiation (fluence, 0.1 J/cm2). Laser irradiation significantly reduced the number of diatoms and bacteria in the biofilm (paired t test; P < 0.05). The removal was better on titanium than on glass coupons.

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