Fabrication and characterization of nano porous lattice biosensor using anodic aluminum oxide substrate

Abstract

Localized surface plasmon resonance (LSPR) attracts attention for the fabrication of a biosensor because it can be used easily and is highly sensitive to the change in surface reflective index. Anodic aluminum oxide (AAO) has self-assembled nanoholes and is fabricated easily all over the Al substrate. The depth and diameter of the nanoholes are easily controlled by changing the etching solution and applied voltage. By depositing a Au thin film on the AAO substrate, the sensitivity of the sensor chip was affected by both optical interference and LSPR. In this study, the optical property of the AAO-based LSPR sensor chip was characterized on the basis of the nanostructure. We presented a biosensing application of the AAO-based LSPR sensor chip. The highest sensitivity of the sensor chip was observed at the AAO nanohole diameter of 75 nm and the AAO nanohole depth of 0.5 µm, when bovine serum albumin (BSA) adsorbed on the sensor chip.

Label-Free Nucleic Acid Biosensing Using Nanomaterial-Based Localized Surface Plasmon Resonance Imaging: A Review

“…As can be seen in Figure f1, the tightly packed nanoantennas are inclined to stick together, reducing the achievable RIS, FOM, and molecular sensitivity. It must be mentioned that Au directly deposited on top of the tubular PAA pores can also be used as an LSPR sensor. − …”

Advances in Optical Biosensors and Sensors Using Nanoporous Anodic Alumina

“…Various applications have been reported for NAA such as biosensors [ 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 ], sensors [ 36 , 66 , 67 , 68 , 69 , 70 , 71 ], drug release [ 72 , 73 , 74 , 75 , 76 ], template-based nanowire, and nanotube fabrication [ 77 , 78 , 79 , 80 ]. Among the various sensors and biosensors that have been reported based on NAA, optical biosensors are the more interesting because of their remote sensing ability and properties such as being small and lightweight, having high sensitivity, and being immune to electromagnetic interference [ 81 , 82 , 83 , 84 , 85 , 86 ].…”

“…Up to now, several optical methods have been reported when using an NAA such as surface plasmon resonance (SPR) [ 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 ], interference localized surface plasmon resonance (ILSPR) [ 36 , 82 , 96 , 97 , 98 , 99 , 100 , 101 ], photoluminescence spectroscopy (PLS) [ 32 , 102 , 103 , 104 , 105 , 106 , 107 ], surface-enhanced Raman scattering (SERS) [ 84 , 108 , 109 , 110 , 111 , 112 , 113 , 114 ], and interferometric reflectance spectroscopy (IRS) [ 59 , 115 , 116 , 117 ]. Among them, IRS is a common optical method that has been applied as the basis for the NAA-based biosensors and sensors.…”

Influence of anodizing process on tensile strength AA 6061 T6

“…Ito et al [11], Capraz et al [12] and Lee et al [13] state that the aluminum anodizing process is an electrochemical method to convert aluminum into aluminum oxide (Al 2 O 3 ) on the surface to be coated to produce a thicker oxide layer than the naturally formed oxide layer so as to improve the physical and mechanical properties of metals the. This can be achieved by making the workpiece as an anode which is then dipped in the appropriate electrolyte cell.…”