Dr Sandeep's review on OFET is out

posted Dec 8, 2018, 7:12 AM by Khaled salama   [ updated Dec 8, 2018, 9:07 AM ]

We are excited to share our review on Organic Field Effect Transistors sensing platforms. This is Dr Sandeep's first paper with the group and more to come soon. Organic field effect transistors (OFETs) have been the focus of sensing application research over the last two decades. The challenges and possible future directions of OFET arrays in embedded sensing platforms are presented.

More details at:
Sandeep G.Surya, Harshil N.Raval, Rafiq Ahmad, PrashantSonar, Khaled N.Salama, V.Ramgopal Rao, Organic field effect transistors (OFETs) in environmental sensing and health monitoring: A reviewTrends in Analytical Chemistry, 2018

Saliva-based inkjet printed glucose paper sensor

posted Dec 3, 2018, 9:11 AM by Khaled salama   [ updated Dec 3, 2018, 9:16 AM ]

Inexpensive and easy-to-use diagnostic tools for fast health screening are imperative, especially in the developing world, where portability and affordability are a necessity. Accurate monitoring of metabolite levels can provide useful information regarding key metabolic activities of the body and detect the concomitant irregularities such as in the case of diabetes, a worldwide chronic disease. Today, the majority of daily glucose monitoring tools rely on piercing the skin to draw blood. The pain and discomfort associated with finger pricking have created a global need to develop non-invasive, portable glucose assays. In this work, we develop a disposable analytical device which can measure physiologically relevant glucose concentrations in human saliva based on enzymatic electrochemical detection. We use inkjet-printing technology for the rapid and low-cost deposition of all the components of this glucose sensor, from the electronics to the biorecognition elements, on commercially available paper substrates.  We demonstrate that one month after its fabrication and storage in air-free environment, the sensor maintains its function with only minor performance loss. This fully printed, all-polymer biosensor with its ease of fabrication, accuracy, sensitivity and compatibility with easy-to-obtain biofluids such as saliva aids in the development of next generation low-cost, non-invasive, eco-friendly, and disposable diagnostic tools. 
More details at:
Eloïse Bihar, Shofarul Wustoni, Anna Maria Pappa, Khaled N. Salama, Derya Baran and Sahika Inal, A fully inkjet-printed disposable glucose sensor on papernpj Flexible Electronics10.1038/s41528-018-0044-y2, 1(2018).

Acetone sensing made easy

posted Nov 12, 2018, 3:40 AM by Khaled salama

Dr Karum, Now Prof. Karum at 
Birla Institute of Technology and Science, posed an interesting question. Can we improve the sensitivity of detection of analytes using a different transduction method?  For this purpose, interdigitated electrode (IDE)-based capacitors and quartz crystal microbalance (QCM)-based resonators were coated with a zeolitic–imidazolate framework (ZIF-8) metal–organic framework thin films as the sensing material and applied to the sensing of the volatile organic compound acetone.

Read more at:
Chappanda, K.N.; Tchalala, M.R.; Shekhah, O.; Surya, S.G.; Eddaoudi, M.; Salama, K.N. A Comparative Study of Interdigitated Electrode and Quartz Crystal Microbalance Transduction Techniques for Metal–Organic Framework-Based Acetone SensorsSensors 201818, 3898.

Fully Funded Internship Opportunities

posted Sep 30, 2018, 12:53 PM by Khaled salama

KAUST offers a variety of programs to attract students worldwide to spend some time at our labs.
Exceptional internship opportunities for (3-6 months): 
A Microelectronics winter camp (4 weeks):
Photonics summer camp (4 weeks): 
Winter Enrichment poster competition (1 week): 

Dr Rafiq's first paper with the group

posted Sep 30, 2018, 8:59 AM by Khaled salama   [ updated Sep 30, 2018, 9:02 AM ]

We are excited to share our review on nanomaterial deposition for biosensor fabrication. This is Dr Rafiq's first paper with the group and more to come soon. The review address the following Nanomaterial deposition methods on electrode surface :
      1. Coating based methods 
      2. Direct deposition-based methods
      3. Printing based methods
      4. Direct-growth 
The reviewers were impressed by the work and commented "The authors do an outstanding job of including the rationale for each approach, the advantages and the shortcomings. They also take clear stands concerning what does NOT work—I really like that! This review will be a very useful addition to the literature and helpful to investigators and students trying to decide how to improve the performance of the electrode-based biosensors. "
More at:  Rafiq Ahmad⁠, Otto S. Wolfbeis⁠, Yoon-Bong Hahn⁠, Husam N. Alshareef⁠, Luisa Torsi⁠ and Khaled N. Salama⁠ "Deposition of nanomaterials: A crucial step in biosensor fabrication," Materials Today Communications, 2018 doi:10.1016/j.mtcomm.2018.09.024

Our first patent on gas sensors!

posted Sep 28, 2018, 11:02 PM by Khaled salama

We are pleased to share the news of having secured a United States Patent No. 10,001,448 on June 19, 2018 and titled 
GAS SENSOR. This patent addresses the usage of capacitive gas sensors using Metal Organics Frame works as the sensing material. This is the result of a 7 year collaboration with Prof. Eddoaudi's group at the Advanced Membranes and Porus Materials Center. We have demonstrated that the technology is capable of detecting or various gases with a high degree of selectivity and sensitivity . 
The work can be checked at:
  1. Valeriya Chernikova, Omar Yassine, Osama Shekhah, Mohamed Eddaoudi, and Khaled N. Salama "Highly sensitive and selective SO2 MOF sensor: The integration of MFM-300 MOF as a sensitive layer on a capacitive interdigitated electrode", Journal of Materials Chemistry A, 2018,6, 5550-5554  [back cover]
  2. Ayalew Assen, Omar YASSINE, Osama Shekhah, Mohamed Eddaoudi, and Khaled Salama,"MOFs for the Sensitive Detection of Ammonia: Deployment of fcu-MOF Thin-Films as Effective Chemical Capacitive Sensors." ACS Sensors 2017 2 (9), 1294-1301 DOI: 10.1021/acssensors.7b00304.
  3. Omar Yassine, Osama Shekhah, Ayalew H. Assen, Youssef Belmabkhout, Khaled N. Salama and Mohamed Eddaoudi "H2S Sensors: Fumarate-Based fcu-MOF Thin Film Grown on a Capacitive Interdigitated Electrode" , Angew. Chem. Int. Ed. 201655, 15930. doi:10.1002/anie.201608780 (back cover)(nanowerk news) (news)
  4. Sapsanis, C.; Omran, H.; Chernikova, V.; Shekhah, O.; Belmabkhout, Y.; Buttner, U.; Eddaoudi, M.; Salama, K.N. Insights on Capacitive Interdigitated Electrodes Coated with MOF Thin Films: Humidity and VOCs Sensing as a Case Study.Sensors15, 18153-18166, 2015.

Dr. Hesham Omran secures an ITIDA grant

posted Sep 22, 2018, 7:30 AM by Khaled salama   [ updated Sep 22, 2018, 11:59 AM ]

Our Lab Alumni, Dr Hesham Omran, currently an Assistant Professor at the Integrated Circuits Lab (ICL), Faculty of Engineering, Ain Shams University, 
just secured his first grant as the lead PI. The project "AutoAIDO: Automation of Analog IC Design and Optimization" is funded for 16 months by the Information Technology Industry Development Agency (ITIDA) - under the Information Technology Academia Collaboration (ITAC) Program.

 He is trying to address the significant design gap between the growing chip complexity and the analog designer’s productivity impacting the design-time, the design-cost, and the products time-to-market (TTM). The aim of this proposal is to provide an analog IC synthesis tool that automates some of the key time-consuming steps in the analog design flow.  He demonstrated some of these ideas in his recent publications:

Olga starts her PhD strong!

posted Sep 20, 2018, 6:50 PM by Khaled salama

Last year we were fortunate to have Olga Krestinskaya spend 5 months with us. She did some amazing work on Analog Backpropagation learning circuits using memristor crossbars. Her work was accepted at the premier circuits journal, IEEE transactions on circuits and systems 1: Regular papers. Olga is supervised by our long time collaborator and friend Prof. Alex James at Nazarbayev University. 

It is worth mentioning that an earlier version of this paper was presented at the flagship circuits society conference ISCAS 2018.T  Read more about it: Analog Backpropagation Learning Circuits for Memristive Crossbar Neural Networks

Enabling IoT applications using RF energy harvesting

posted Sep 14, 2018, 4:02 AM by Khaled salama   [ updated Sep 14, 2018, 4:26 AM ]

PhD students Azamat and Thang demonstrate a novel fractal-based antenna for the first time which enables simultaneous operation at three important frequencies (GSM 900, GSM 1800 and 3 G 2.1 GHz). 
Complete rectenna system testing in a field has shown decent harvested energy which is suitable to power small sensor nodes of IoT applications.  Rectenna has been implemented by additive manufacturing techniques (combination of 3D printing and screen printing) which enables cost savings as well as future mass manufacturing viability. The Antenna has been implemented on the package of the circuits (rectifier, matching network and battery), which is not typically the case as antennas are implemented on separate PCB. By utilizing System-on-Package (SoP) concept, size and cost of the harvester are reduced, and available space is optimized• The work was accepted at the prestigious Elsevier Nano Energy journal (IF=13). This work is in collaboration with Prof. Atif Shamim. 
More details at: Fully Printed 3D Cube-Shaped Multiband Fractal Rectenna for Ambient RF Energy Harvesting
Congratulations Azamat and Thang.

Its worth mentioning that this work builds on our earlier work:
  1. Abdullah Almansouri, Mahmoud Ouda and  Khaled N. Salama,A CMOS RF-to- DC Power Converter with 86% Efficiency and -19.2dBm Sensitivity”, IEEE Transactions on Microwave Theory and Techniques, vol 66, no 5, pp 2409-2415, 2018 doi:10.1109/TMTT.2017.2785251
  2. Muhammad Fahad Farooqui Muhammad Akram Karimi, Khaled Nabil Salama and Atif Shamim, 3D-Printed Disposable Wireless Sensors with Integrated Microelectronics for Large Area Environmental Monitoring" Advanced Materials Technologies, 20172, 1700051 DOI: 10.1002/admt.201700051 [news] [more news]
  3. M. Ouda, W. Khalil and K.N. Salama, "Self-Biased Differential Rectifier with Enhanced Dynamic Range for Wireless Powering" IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 64, no. 5, pp 515-519,  2017 doi:10.1109/TCSII.2016.2591263
  4. M. Ouda, W. Khalil and K.N. Salama, "Wide-Range Adaptive RF-to-DC Power Converter for UHF RFIDs," IEEE Microwave and Wireless Components Letters, Vol 26, no 8, pp 634 - 6362016, 2016 10.1109/LMWC.2016.2586077
  5. M. Ouda, L. Marnat, A. Shamim, K N Salama, 5.2-GHz RF Power Harvesting Module in 0.18 μm CMOS for Biomedical Implantable Sensors, IEEE Transactions on Microwave Theory and Techniques, vol 61, n 5, pp 2177-2184,  2013
  6.  L. Marnat, M. Ouda, M. Arsalan, K. Salama, A. Shamim, "On-chip implantable antennas for wireless power and data transfer in a glaucoma monitoring SoC", IEEE Antennas and Wireless Propagation Letters (AWPL), vol 11, pp 1671-1674, 2012 

Talks, Talks and more Talks

posted Sep 7, 2018, 9:54 AM by Khaled salama

Interesting discussions on future trends of memristive circuit applications with Prof. Alex James and his students at Nazarbayev University, Astana Kazakhstan. 

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