This work demonstrates a novel label free and sensitive approach for the detection of L-histidine. This is a simple and reliable method for ultra-low level detection of L-histidine. All solution processed synthesizing technique was utilized to develop such type of detection scheme. Silicon substrate was replaced by normal transparent sheet to make it more facile and cost-effective detection technique. Fabricated device for L-histidine detection works upon the variation of current through the ZnO nanorod with L-histidine concentration. Operation principle strongly depends upon the electron charge transfer between metal cation and L-histidine inside the chelating complex. Morphological, structural and optical characterization of solution processed synthesized ZnO nanorod (ZnO NR) was carried out prior to sensor device fabrication. Our sensor device exhibits the sensitivity around 0.86 nA/fM and lower limit of detection (LOD) ∼ 0.1 fM(S/N=3).

In this paper, we demonstrate an electrical detection technique based on solution processed zinc oxide nanosphere for ultra-low level detection of bovine serum albumin (BSA). Our sensor device works on the basis of the variation of conductance of the ZnO nanosphere with different concentration of BSA. The morphological and structural characterizations of ZnO nanosphere were carried out by transmission electron microscopy (TEM), scanning electron microscopy (SEM), and X-ray diffraction (XRD). Circular dichroism (CD) spectroscopy was performed to investigate the chemical interaction between the BSA and zinc oxide nanosphere. Optical detection was performed using absorbance and Fourier transform infrared spectroscopy (FTIR) studies. Our device exhibits sensitivity 0.126 nA/pM, lower limit of detection (LOD) 10 pM and the fast response time around 5 s, confirming the highest sensitivity for BSA detection achieved so far. Sensing mechanism is governed on the basis of the charge transfer phenomenon between BSA and ZnO. All measurements were carried out at 1 V bias for low power operation.

No abstract

This work involves a method to communicate one to one by hiding the information among all the people. Digital photographs are the most suitable components compared to other things available on the internet as transmitter based on their availability. This work basically ciphered message within a photographs. For hiding secret information in images, there exist an outsized sort of steganographic techniques some are more complex than others and every one of them have respective strong and weak points. Different applications may have separate requirements of the cipher technique used. for instance, some applications may require absolute invisibility of the key information, while others require a bigger secret message to be hidden. This work intends to offer an summary of image steganography, its uses and techniques. LSB (Least Significant Bit) technique is used for this work. Here bits of the text are replaced by the LSBs of the pixel values of the image. because the LSBs are alone changed, normal human eyes cannot predict the difference between the first image and therefore the resulting image. In this work, the pixel indicator technique has been used to hide information in RGB Images. Least two significant bits are used for this proposed methodology as of one for the channels of Red, Green or Blue as an indicator of data existence in the other two channels. Based on the image nature indicator bits will be generated randomly in the channel.

No abstract