Sanna Ullah - Academia.edu (original) (raw)

Papers by Sanna Ullah

Research paper thumbnail of A simple and ultra‐sensitive electrochemical sensing approach for detection of arsenic (v) in drinking water

Electroanalysis, Jan 13, 2024

A very sensitive and ultra-selective electrochemical sensing device with high conductivity and du... more A very sensitive and ultra-selective electrochemical sensing device with high conductivity and durability was made using styrene, ethylene glycol dimethacrylate (EGDMA), and functionalised graphene oxide. To construct a mediator-free, non-enzymatic sensing probe for the detection of arsenic (v) ions, a recently synthesized sensor was impregnated onto an interdigital electrode (IDE) surface. The newly developed receptors were characterized using Fourier Transmission Infra-Red (FTIR) and Atomic Force Microscopy (AFM). Under the optimized experimental conditions, sensor showed the lowest detection limit of 0.11 ppb with highest sensitivity (3460 ppb) and a strong linear relationship in the range of 50 ppm–1 ppb of As (v) concentration. The ion imprinting technique is employed to enhance the selectivity of the fabricated sensor. The arsenic sensor is found to be highly selective in the presence of interfering species like AlCl3, FeCl3, and CoCl3 etc. The electrochemical sensor proved to be reliable and could be reused after proper storage, also exhibit a high repeatability response and maintains of 99 % of its initial sensor response for detection after repeated use of one to six months. This effort showed excellent results in an electrochemical sensor with sensitivity, selectivity, stability, and reversibility for detecting trace quantities of As (v) in real water samples.

Research paper thumbnail of Identification of Factors Affecting Risk Appetite of Organizations in Selection of Mega Construction Projects

Buildings, Dec 21, 2021

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of The Moderating Effect of Social Media on the Relationship between Value Co-creation and Brand Equity in the Services Sector (Banking) Context

International journal of academic research in business & social sciences, Aug 15, 2023

Brand equity is one of the most significant concepts in branding and marketing, and its model and... more Brand equity is one of the most significant concepts in branding and marketing, and its model and measurement have interested many academics and practitioners. Most of the research on brand equity has focused on physical goods, with a need for studies on the service sector in general and particularly in the banking sector in developing countries. The need for more research in this area appears contradictory, as branding plays a distinctive role, particularly in the service sector. Most of the research on brand equity has focused on developed countries and yielded good results; thus, it would suggest a regional focus on developing countries. There needs to be more empirical evidence in the service and banking sectors, particularly in developing economies. This study contributes to scholarly attempts to fill the gaps in the brand equity literature regarding the service sector of banks. This study focused on general commercial banks in Pakistan without distinguishing between Islamic and conventional banks. Therefore, future research could carefully distinguish between Islamic and conventional banks and compare brand equity models across them to better understand the differences and similarities.

Research paper thumbnail of Identification of Various Execution Modes and Their Respective Risks for Public–Private Partnership (PPP) Infrastructure Projects

Buildings

The public–private partnership (PPP) based model for the execution of infrastructure projects ori... more The public–private partnership (PPP) based model for the execution of infrastructure projects originated from Anglo-Saxon countries and was initially used in 1977 by the United Kingdom (U.K). Since then, its popularity has increased worldwide. Earlier studies by researchers and many other professional sectors and departments have introduced PPP contracts into different execution modes like Build, Operate, and Transfer (BOT); Build, Own, Operate, and Transfer (BOOT); and Build, Lease, and Transfer (BLT), etc. All definitions of PPP contracts are different but have a few common characteristics and risks. Previously, numerous pieces of literature were available on these common risks for various execution modes of PPP contracts. However, each PPP mode still has unique risks that must be identified to understand and successfully implement the PPP projects properly. This paper fills the gap mentioned above and aims to identify various commonly used PPP execution modes in infrastructure pr...

Research paper thumbnail of Identification of Factors Affecting Risk Appetite of Organizations in Selection of Mega Construction Projects

Buildings, 2021

Risk appetite is a crucial component that plays a key role in the decision-making process of proj... more Risk appetite is a crucial component that plays a key role in the decision-making process of project risk management. Despite rising scholarly interest in project risk management, risk appetite has received little attention thus far. A well-defined risk appetite ensures that all decisions taken throughout the course of a project are consistent with an organization’s ultimate strategic aim. This research aims to identify the factors affecting the risk appetite of megaproject selection in the construction sector. The study adds to the knowledge of risk appetite in mega construction project selection and qualitatively examines the factors affecting risk appetite. Exploratory research design is used to identify these factors. The factors are identified using semi-structured interviews of 30 practitioners from the top and middle management working on mega construction projects. Thematic analysis was performed using NVIVO academic software. The most highlighted factors are financial attri...

Research paper thumbnail of A simple and ultra‐sensitive electrochemical sensing approach for detection of arsenic (v) in drinking water

Electroanalysis, Jan 13, 2024

A very sensitive and ultra-selective electrochemical sensing device with high conductivity and du... more A very sensitive and ultra-selective electrochemical sensing device with high conductivity and durability was made using styrene, ethylene glycol dimethacrylate (EGDMA), and functionalised graphene oxide. To construct a mediator-free, non-enzymatic sensing probe for the detection of arsenic (v) ions, a recently synthesized sensor was impregnated onto an interdigital electrode (IDE) surface. The newly developed receptors were characterized using Fourier Transmission Infra-Red (FTIR) and Atomic Force Microscopy (AFM). Under the optimized experimental conditions, sensor showed the lowest detection limit of 0.11 ppb with highest sensitivity (3460 ppb) and a strong linear relationship in the range of 50 ppm–1 ppb of As (v) concentration. The ion imprinting technique is employed to enhance the selectivity of the fabricated sensor. The arsenic sensor is found to be highly selective in the presence of interfering species like AlCl3, FeCl3, and CoCl3 etc. The electrochemical sensor proved to be reliable and could be reused after proper storage, also exhibit a high repeatability response and maintains of 99 % of its initial sensor response for detection after repeated use of one to six months. This effort showed excellent results in an electrochemical sensor with sensitivity, selectivity, stability, and reversibility for detecting trace quantities of As (v) in real water samples.

Research paper thumbnail of Identification of Factors Affecting Risk Appetite of Organizations in Selection of Mega Construction Projects

Buildings, Dec 21, 2021

This article is an open access article distributed under the terms and conditions of the Creative... more This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY

Research paper thumbnail of The Moderating Effect of Social Media on the Relationship between Value Co-creation and Brand Equity in the Services Sector (Banking) Context

International journal of academic research in business & social sciences, Aug 15, 2023

Brand equity is one of the most significant concepts in branding and marketing, and its model and... more Brand equity is one of the most significant concepts in branding and marketing, and its model and measurement have interested many academics and practitioners. Most of the research on brand equity has focused on physical goods, with a need for studies on the service sector in general and particularly in the banking sector in developing countries. The need for more research in this area appears contradictory, as branding plays a distinctive role, particularly in the service sector. Most of the research on brand equity has focused on developed countries and yielded good results; thus, it would suggest a regional focus on developing countries. There needs to be more empirical evidence in the service and banking sectors, particularly in developing economies. This study contributes to scholarly attempts to fill the gaps in the brand equity literature regarding the service sector of banks. This study focused on general commercial banks in Pakistan without distinguishing between Islamic and conventional banks. Therefore, future research could carefully distinguish between Islamic and conventional banks and compare brand equity models across them to better understand the differences and similarities.

Research paper thumbnail of Identification of Various Execution Modes and Their Respective Risks for Public–Private Partnership (PPP) Infrastructure Projects

Buildings

The public–private partnership (PPP) based model for the execution of infrastructure projects ori... more The public–private partnership (PPP) based model for the execution of infrastructure projects originated from Anglo-Saxon countries and was initially used in 1977 by the United Kingdom (U.K). Since then, its popularity has increased worldwide. Earlier studies by researchers and many other professional sectors and departments have introduced PPP contracts into different execution modes like Build, Operate, and Transfer (BOT); Build, Own, Operate, and Transfer (BOOT); and Build, Lease, and Transfer (BLT), etc. All definitions of PPP contracts are different but have a few common characteristics and risks. Previously, numerous pieces of literature were available on these common risks for various execution modes of PPP contracts. However, each PPP mode still has unique risks that must be identified to understand and successfully implement the PPP projects properly. This paper fills the gap mentioned above and aims to identify various commonly used PPP execution modes in infrastructure pr...

Research paper thumbnail of Identification of Factors Affecting Risk Appetite of Organizations in Selection of Mega Construction Projects

Buildings, 2021

Risk appetite is a crucial component that plays a key role in the decision-making process of proj... more Risk appetite is a crucial component that plays a key role in the decision-making process of project risk management. Despite rising scholarly interest in project risk management, risk appetite has received little attention thus far. A well-defined risk appetite ensures that all decisions taken throughout the course of a project are consistent with an organization’s ultimate strategic aim. This research aims to identify the factors affecting the risk appetite of megaproject selection in the construction sector. The study adds to the knowledge of risk appetite in mega construction project selection and qualitatively examines the factors affecting risk appetite. Exploratory research design is used to identify these factors. The factors are identified using semi-structured interviews of 30 practitioners from the top and middle management working on mega construction projects. Thematic analysis was performed using NVIVO academic software. The most highlighted factors are financial attri...